diff --git a/.github/workflows/annocheck.yml b/.github/workflows/annocheck.yml
deleted file mode 100644
index be85205fee..0000000000
--- a/.github/workflows/annocheck.yml
+++ /dev/null
@@ -1,112 +0,0 @@
-name: Annocheck
-
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  compile:
-    name: test-annocheck
-
-    runs-on: ubuntu-latest
-
-    container:
-      image: ghcr.io/ruby/ruby-ci-image:gcc-11
-      options: --user root
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    env:
-      CONFIGURE_TTY: never
-      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
-      RUBY_DEBUG: ci rgengc
-      RUBY_TESTOPTS: >-
-        -q
-        --color=always
-        --tty=no
-      # FIXME: Drop skipping options
-      # https://bugs.ruby-lang.org/issues/18061
-      # https://sourceware.org/annobin/annobin.html/Test-pie.html
-      TEST_ANNOCHECK_OPTS: '--skip-pie --skip-gaps'
-
-    steps:
-      - run: id
-        working-directory:
-
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          sparse-checkout-cone-mode: false
-          sparse-checkout: /.github
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          srcdir: src
-          builddir: build
-          makeup: true
-
-      - uses: ruby/setup-ruby@a9bfc2ecf3dd40734a9418f89a7e9d484c32b990 # v1.248.0
-        with:
-          ruby-version: '3.1'
-          bundler: none
-
-      # Minimal flags to pass the check.
-      # -g0 disables backtraces when SEGV.  Do not set that.
-      - name: Run configure
-        run: >
-          ../src/configure -C
-          --enable-debug-env
-          --disable-install-doc
-          --with-ext=-test-/cxxanyargs,+
-          --without-valgrind
-          --without-jemalloc
-          --without-gmp
-          --with-gcc="gcc-11 -fcf-protection -Wa,--generate-missing-build-notes=yes"
-          --enable-shared
-          debugflags=-ggdb3
-          optflags=-O2
-          LDFLAGS=-Wl,-z,now
-
-      - run: make showflags
-
-      - run: make
-
-      - run: make test-annocheck
-
-      - uses: ./.github/actions/slack
-        with:
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
-
-defaults:
-  run:
-    working-directory: build
diff --git a/.github/workflows/auto_request_review.yml b/.github/workflows/auto_request_review.yml
deleted file mode 100644
index 207315a084..0000000000
--- a/.github/workflows/auto_request_review.yml
+++ /dev/null
@@ -1,20 +0,0 @@
-name: Auto Request Review
-on:
-  pull_request_target:
-    types: [opened, ready_for_review, reopened]
-    branches: [master]
-
-permissions:
-  contents: read
-
-jobs:
-  auto-request-review:
-    name: Auto Request Review
-    runs-on: ubuntu-latest
-    if: ${{ github.repository == 'ruby/ruby' && github.base_ref == 'master' }}
-    steps:
-      - name: Request review based on files changes and/or groups the author belongs to
-        uses: necojackarc/auto-request-review@e89da1a8cd7c8c16d9de9c6e763290b6b0e3d424 # v0.13.0
-        with:
-          # scope: public_repo
-          token: ${{ secrets.MATZBOT_AUTO_REQUEST_REVIEW_TOKEN }}
diff --git a/.github/workflows/baseruby.yml b/.github/workflows/baseruby.yml
deleted file mode 100644
index 87162936fd..0000000000
--- a/.github/workflows/baseruby.yml
+++ /dev/null
@@ -1,76 +0,0 @@
-name: BASERUBY Check
-
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  baseruby:
-    name: BASERUBY
-
-    runs-on: ubuntu-22.04
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    strategy:
-      matrix:
-        ruby:
-          - ruby-3.1
-          - ruby-3.2
-          - ruby-3.3
-
-    steps:
-      - uses: ruby/setup-ruby@a9bfc2ecf3dd40734a9418f89a7e9d484c32b990 # v1.248.0
-        with:
-          ruby-version: ${{ matrix.ruby }}
-          bundler: none
-
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-
-      - uses: ./.github/actions/setup/ubuntu
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          makeup: true
-
-      - run: ./configure --disable-install-doc
-
-      - run: make all
-
-      - run: make test
-
-      - uses: ./.github/actions/slack
-        with:
-          label: ${{ matrix.ruby }}
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
diff --git a/.github/workflows/bundled_gems.yml b/.github/workflows/bundled_gems.yml
deleted file mode 100644
index 27ad55307b..0000000000
--- a/.github/workflows/bundled_gems.yml
+++ /dev/null
@@ -1,136 +0,0 @@
-name: bundled_gems
-
-on:
-  push:
-    branches: ['master']
-    paths:
-      - '.github/workflows/bundled_gems.yml'
-      - 'gems/bundled_gems'
-  pull_request:
-    branches: ['master']
-    paths:
-      - '.github/workflows/bundled_gems.yml'
-      - 'gems/bundled_gems'
-  merge_group:
-  schedule:
-    - cron: '45 6 * * *'
-  workflow_dispatch:
-
-permissions: # added using https://github.com/step-security/secure-workflows
-  contents: read
-
-jobs:
-  update:
-    permissions:
-      contents: write # for Git to git push
-
-    if: ${{ github.event_name != 'schedule' || github.repository == 'ruby/ruby' }}
-
-    name: update ${{ github.workflow }}
-
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          token: ${{ (github.repository == 'ruby/ruby' && !startsWith(github.event_name, 'pull')) && secrets.MATZBOT_AUTO_UPDATE_TOKEN || secrets.GITHUB_TOKEN }}
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          # Skip overwriting MATZBOT_AUTO_UPDATE_TOKEN
-          checkout: '' # false (ref: https://github.com/actions/runner/issues/2238)
-
-      - name: Set ENV
-        run: |
-          echo "TODAY=$(date +%F)" >> $GITHUB_ENV
-
-      - name: Download previous gems list
-        run: |
-          mkdir -p .downloaded-cache
-          for data in bundled_gems.json default_gems.json; do
-            ln -s .downloaded-cache/$data .
-            curl -O -R -z ./$data https://stdgems.org/$data
-          done
-
-      - name: Update bundled gems list
-        id: bundled_gems
-        run: |
-          ruby -i~ tool/update-bundled_gems.rb gems/bundled_gems >> $GITHUB_OUTPUT
-
-      - name: Update spec/bundler/support/builders.rb
-        run: |
-          #!ruby
-          rake_version = File.read("gems/bundled_gems")[/^rake\s+(\S+)/, 1]
-          print ARGF.read.sub(/^ *def rake_version\s*\K".*?"/) {rake_version.dump}
-        shell: ruby -i~ {0} spec/bundler/support/builders.rb
-
-      - name: Maintain updated gems list in NEWS
-        run: |
-          ruby tool/update-NEWS-gemlist.rb bundled
-
-      - name: Check diffs
-        id: diff
-        run: |
-          news= gems=
-          git diff --color --no-ext-diff --ignore-submodules --exit-code -- NEWS.md ||
-          news=true
-          git diff --color --no-ext-diff --ignore-submodules --exit-code -- gems/bundled_gems ||
-          gems=true
-          git add -- NEWS.md gems/bundled_gems
-          git add -- spec/bundler/support/builders.rb
-          echo news=$news >> $GITHUB_OUTPUT
-          echo gems=$gems >> $GITHUB_OUTPUT
-          echo update=${news:-$gems} >> $GITHUB_OUTPUT
-
-      - name: Install libraries
-        uses: ./.github/actions/setup/ubuntu
-        if: ${{ steps.diff.outputs.gems }}
-
-      - name: Build
-        run: |
-          ./autogen.sh
-          ./configure -C --disable-install-doc
-          make
-        if: ${{ steps.diff.outputs.gems }}
-
-      - name: Prepare bundled gems
-        run: |
-          make -s prepare-gems
-        if: ${{ steps.diff.outputs.gems }}
-
-      - name: Test bundled gems
-        run: |
-          make -s test-bundled-gems
-        timeout-minutes: 30
-        env:
-          RUBY_TESTOPTS: '-q --tty=no'
-          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ''
-        if: ${{ steps.diff.outputs.gems }}
-
-      - name: Commit
-        run: |
-          git pull --ff-only origin ${GITHUB_REF#refs/heads/}
-          message="Update bundled gems list"
-          if [ -z "${gems}" ]; then
-            git commit --message="[DOC] ${message} at ${GITHUB_SHA:0:30}"
-          else
-            git commit --message="${message} as of ${TODAY}"
-          fi
-          git push origin ${GITHUB_REF#refs/heads/}
-        env:
-          TODAY: ${{ steps.bundled_gems.outputs.latest_date || env.TODAY }}
-          EMAIL: svn-admin@ruby-lang.org
-          GIT_AUTHOR_NAME: git
-          GIT_COMMITTER_NAME: git
-          gems: ${{ steps.diff.outputs.gems }}
-        if: >-
-          ${{
-          github.repository == 'ruby/ruby' &&
-          !startsWith(github.event_name, 'pull') &&
-          steps.diff.outputs.update
-          }}
-
-      - uses: ./.github/actions/slack
-        with:
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
diff --git a/.github/workflows/check_dependencies.yml b/.github/workflows/check_dependencies.yml
deleted file mode 100644
index 6d85cf8e9c..0000000000
--- a/.github/workflows/check_dependencies.yml
+++ /dev/null
@@ -1,63 +0,0 @@
-name: Check Dependencies
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  update-deps:
-    name: Dependency checks
-
-    strategy:
-      matrix:
-        os: [ubuntu-latest]
-      fail-fast: true
-
-    runs-on: ${{ matrix.os }}
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-
-      - uses: ./.github/actions/setup/ubuntu
-        if: ${{ contains(matrix.os, 'ubuntu') }}
-
-      - uses: ./.github/actions/setup/macos
-        if: ${{ contains(matrix.os, 'macos') }}
-
-      - uses: ./.github/actions/setup/directories
-
-      - uses: ruby/setup-ruby@a9bfc2ecf3dd40734a9418f89a7e9d484c32b990 # v1.248.0
-        with:
-          ruby-version: '3.1'
-          bundler: none
-
-      - name: Run configure
-        run: ./configure -C --disable-install-doc --disable-rubygems --with-gcc 'optflags=-O0' 'debugflags=-save-temps=obj -g'
-
-      - run: make all golf
-
-      - run: ./goruby -veh
-
-      - run: ruby tool/update-deps --fix
-
-      - run: git diff --no-ext-diff --ignore-submodules --exit-code
-
-      - uses: ./.github/actions/slack
-        with:
-          label: ${{ matrix.os }} / Dependencies need to update
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
diff --git a/.github/workflows/check_misc.yml b/.github/workflows/check_misc.yml
deleted file mode 100644
index 5267bd35f1..0000000000
--- a/.github/workflows/check_misc.yml
+++ /dev/null
@@ -1,120 +0,0 @@
-name: Misc
-on: [push, pull_request, merge_group]
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  checks:
-    name: Miscellaneous checks
-
-    permissions:
-      contents: write # for Git to git push
-
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          token: ${{ (github.repository == 'ruby/ruby' && !startsWith(github.event_name, 'pull')) && secrets.MATZBOT_AUTO_UPDATE_TOKEN || secrets.GITHUB_TOKEN }}
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          makeup: true
-          # Skip overwriting MATZBOT_AUTO_UPDATE_TOKEN
-          checkout: '' # false (ref: https://github.com/actions/runner/issues/2238)
-
-      # Run this step first to make sure auto-style commits are pushed
-      - name: ${{ github.ref == 'refs/heads/master' && 'Auto-correct' || 'Check for' }} code styles
-        run: |
-          set -x
-          ruby tool/auto-style.rb "$GITHUB_OLD_SHA" "$GITHUB_NEW_SHA" "$PUSH_REF"
-        env:
-          EMAIL: svn-admin@ruby-lang.org
-          GIT_AUTHOR_NAME: git
-          GIT_COMMITTER_NAME: git
-          GITHUB_OLD_SHA: ${{ github.event.pull_request.base.sha }}
-          GITHUB_NEW_SHA: ${{ github.event.pull_request.merge_commit_sha }}
-          PUSH_REF: ${{ github.ref == 'refs/heads/master' && github.ref || '' }}
-        if: ${{ github.repository == 'ruby/ruby' && startsWith(github.event_name, 'pull') }}
-
-      - name: Check if C-sources are US-ASCII
-        run: |
-          grep -r -n --include='*.[chyS]' --include='*.asm' $'[^\t-~]' -- . && exit 1 || :
-
-      - name: Check for bash specific substitution in configure.ac
-        run: |
-          git grep -n '\${[A-Za-z_0-9]*/' -- configure.ac && exit 1 || :
-
-      - name: Check for header macros
-        run: |
-          fail=
-          for header in ruby/*.h; do
-            git grep -l -F -e $header -e HAVE_`echo $header | tr a-z./ A-Z__` -- . > /dev/null && continue
-            fail=1
-            echo $header
-          done
-          exit $fail
-        working-directory: include
-
-      - name: Check if to generate documents
-        id: rdoc
-        run: |
-          ref=$(sed 's/#.*//;/^rdoc /!d' gems/bundled_gems | awk '{print $4}')
-          echo ref=$ref >> $GITHUB_OUTPUT
-        # Generate only when document commit/PR
-        if: >-
-          ${{false
-          || contains(github.event.head_commit.message, '[ruby/rdoc]')
-          || contains(github.event.head_commit.message, '[DOC]')
-          || contains(github.event.head_commit.message, 'Document')
-          || contains(github.event.pull_request.title, '[DOC]')
-          || contains(github.event.pull_request.title, 'Document')
-          || contains(github.event.pull_request.labels.*.name, 'Documentation')
-          }}
-
-      - name: Checkout rdoc
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
-        with:
-          repository: ruby/rdoc
-          ref: ${{ steps.rdoc.outputs.ref }}
-          path: .bundle/gems/rdoc-0
-        if: ${{ steps.rdoc.outputs.ref != '' }}
-
-      - name: Generate rdoc
-        run: |
-          set -x
-          gempath=$(ruby -e 'print Gem.user_dir, "/bin"')
-          PATH=$gempath:$PATH
-          gem install --user bundler
-          bundle config --local path vendor/bundle
-          bundle install --jobs 4
-          bundle exec rake generate
-        working-directory: .bundle/gems/rdoc-0
-        if: ${{ steps.rdoc.outputs.ref != '' }}
-
-      - name: Generate docs
-        id: docs
-        run: |
-          $RDOC -C -x ^ext -x ^lib .
-          $RDOC --op html .
-          echo htmlout=ruby-html-${GITHUB_SHA:0:10} >> $GITHUB_OUTPUT
-        env:
-          RDOC: ruby -W0 --disable-gems tool/rdoc-srcdir -q
-        if: ${{ steps.rdoc.outcome == 'success' }}
-
-      - name: Upload docs
-        uses: actions/upload-artifact@v4
-        with:
-          path: html
-          name: ${{ steps.docs.outputs.htmlout }}
-        if: ${{ steps.docs.outcome == 'success' }}
-
-      - uses: ./.github/actions/slack
-        with:
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
deleted file mode 100644
index 0dfae7f045..0000000000
--- a/.github/workflows/codeql-analysis.yml
+++ /dev/null
@@ -1,123 +0,0 @@
-name: 'CodeQL'
-
-on:
-  push:
-    branches: ['master']
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  schedule:
-    - cron: '0 12 * * *'
-  workflow_dispatch:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions: # added using https://github.com/step-security/secure-workflows
-  contents: read
-
-jobs:
-  analyze:
-    name: Analyze
-    runs-on: ubuntu-latest
-    permissions:
-      actions: read # for github/codeql-action/init to get workflow details
-      contents: read # for actions/checkout to fetch code
-      security-events: write # for github/codeql-action/autobuild to send a status report
-    # CodeQL fails to run pull requests from dependabot due to missing write access to upload results.
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    env:
-      enable_install_doc: no
-
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - language: cpp
-          - language: ruby
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-
-      - name: Install libraries
-        if: ${{ contains(matrix.os, 'macos') }}
-        uses: ./.github/actions/setup/macos
-
-      - name: Install libraries
-        if : ${{ matrix.os == 'ubuntu-latest' }}
-        uses: ./.github/actions/setup/ubuntu
-
-      - uses: ./.github/actions/setup/directories
-
-      - name: Remove an obsolete rubygems vendored file
-        if: ${{ matrix.os == 'ubuntu-latest' }}
-        run: sudo rm /usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb
-
-      - name: Initialize CodeQL
-        uses: github/codeql-action/init@df409f7d9260372bd5f19e5b04e83cb3c43714ae # v3.27.9
-        with:
-          languages: ${{ matrix.language }}
-          trap-caching: false
-          debug: true
-
-      - name: Autobuild
-        uses: github/codeql-action/autobuild@df409f7d9260372bd5f19e5b04e83cb3c43714ae # v3.27.9
-
-      - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@df409f7d9260372bd5f19e5b04e83cb3c43714ae # v3.27.9
-        with:
-          category: '/language:${{ matrix.language }}'
-          upload: False
-          output: sarif-results
-
-      - name: filter-sarif
-        uses: advanced-security/filter-sarif@f3b8118a9349d88f7b1c0c488476411145b6270d # v1.0.1
-        with:
-          patterns: |
-            +**/*.rb
-            -lib/uri/mailto.rb:rb/overly-large-range
-            -lib/uri/rfc3986_parser.rb:rb/overly-large-range
-            -lib/bundler/vendor/uri/lib/uri/mailto.rb:rb/overly-large-range
-            -lib/bundler/vendor/uri/lib/uri/rfc3986_parser.rb:rb/overly-large-range
-            -test/ruby/test_io.rb:rb/non-constant-kernel-open
-            -test/open-uri/test_open-uri.rb:rb/non-constant-kernel-open
-            -test/open-uri/test_ssl.rb:rb/non-constant-kernel-open
-            -spec/ruby/core/io/binread_spec.rb:rb/non-constant-kernel-open
-            -spec/ruby/core/io/readlines_spec.rb:rb/non-constant-kernel-open
-            -spec/ruby/core/io/foreach_spec.rb:rb/non-constant-kernel-open
-            -spec/ruby/core/io/write_spec.rb:rb/non-constant-kernel-open
-            -spec/ruby/core/io/read_spec.rb:rb/non-constant-kernel-open
-            -spec/ruby/core/kernel/open_spec.rb:rb/non-constant-kernel-open
-          input: sarif-results/${{ matrix.language }}.sarif
-          output: sarif-results/${{ matrix.language }}.sarif
-        if: ${{ matrix.language == 'ruby' }}
-        continue-on-error: true
-
-      - name: Upload SARIF
-        uses: github/codeql-action/upload-sarif@df409f7d9260372bd5f19e5b04e83cb3c43714ae # v3.27.9
-        with:
-          sarif_file: sarif-results/${{ matrix.language }}.sarif
-        continue-on-error: true
diff --git a/.github/workflows/compilers.yml b/.github/workflows/compilers.yml
deleted file mode 100644
index f52cab9708..0000000000
--- a/.github/workflows/compilers.yml
+++ /dev/null
@@ -1,339 +0,0 @@
-# Some tests depending on this name 'Compilations' via $GITHUB_WORKFLOW. Make sure to update such tests when renaming this workflow.
-name: Compilations
-
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-# Each job is split so that they roughly take 30min to run through.
-jobs:
-  compile-if:
-    name: 'omnibus compilations, trigger'
-    runs-on: ubuntu-latest
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-    steps:
-      - run: true
-        working-directory:
-
-  compile1:
-    name: 'omnibus compilations, #1'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    timeout-minutes: 60
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      # Set fetch-depth: 10 so that Launchable can receive commits information.
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - name: 'clang 18 LTO'
-        uses: './.github/actions/compilers'
-        with:
-          tag: clang-18
-          with_gcc: 'clang-18 -flto=auto'
-          optflags: '-O2'
-          enable_shared: false
-      - { uses: './.github/actions/compilers', name: '-O0', with: { optflags: '-O0 -march=x86-64 -mtune=generic' } }
-      # - { uses: './.github/actions/compilers', name: '-O3', with: { optflags: '-O3 -march=x86-64 -mtune=generic', check: true } }
-
-  compile2:
-    name: 'omnibus compilations, #2'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    timeout-minutes: 60
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - name: 'GCC 15 LTO'
-        uses: './.github/actions/compilers'
-        with:
-          tag: gcc-15
-          with_gcc: 'gcc-15 -flto=auto -ffat-lto-objects -Werror=lto-type-mismatch'
-          optflags: '-O2'
-          enable_shared: false
-      - { uses: './.github/actions/compilers', name: 'ext/Setup', with: { static_exts: 'etc json/* */escape' } }
-      - { uses: './.github/actions/compilers', name: 'GCC 15', with: { tag: 'gcc-15' } }
-      - { uses: './.github/actions/compilers', name: 'GCC 14', with: { tag: 'gcc-14' } }
-      - { uses: './.github/actions/compilers', name: 'GCC 13', with: { tag: 'gcc-13' } }
-      - { uses: './.github/actions/compilers', name: 'GCC 12', with: { tag: 'gcc-12' } }
-      - { uses: './.github/actions/compilers', name: 'GCC 11', with: { tag: 'gcc-11' } }
-      - { uses: './.github/actions/compilers', name: 'GCC 10', with: { tag: 'gcc-10' } }
-      - { uses: './.github/actions/compilers', name: 'GCC 9',  with: { tag: 'gcc-9'  } }
-      - { uses: './.github/actions/compilers', name: 'GCC 8',  with: { tag: 'gcc-8'  } }
-      - { uses: './.github/actions/compilers', name: 'GCC 7',  with: { tag: 'gcc-7'  } }
-
-  compile3:
-    name: 'omnibus compilations, #3'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    timeout-minutes: 60
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'clang 22', with: { tag: 'clang-22' } }
-      - { uses: './.github/actions/compilers', name: 'clang 21', with: { tag: 'clang-21' } }
-      - { uses: './.github/actions/compilers', name: 'clang 20', with: { tag: 'clang-20' } }
-      - { uses: './.github/actions/compilers', name: 'clang 19', with: { tag: 'clang-19' } }
-      - { uses: './.github/actions/compilers', name: 'clang 18', with: { tag: 'clang-18' } }
-      - { uses: './.github/actions/compilers', name: 'clang 17', with: { tag: 'clang-17' } }
-      - { uses: './.github/actions/compilers', name: 'clang 16', with: { tag: 'clang-16' } }
-      - { uses: './.github/actions/compilers', name: 'clang 15', with: { tag: 'clang-15' } }
-      - { uses: './.github/actions/compilers', name: 'clang 14', with: { tag: 'clang-14' } }
-
-  compile4:
-    name: 'omnibus compilations, #4'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    timeout-minutes: 60
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'clang 13', with: { tag: 'clang-13' } }
-      - { uses: './.github/actions/compilers', name: 'clang 12', with: { tag: 'clang-12' } }
-      - { uses: './.github/actions/compilers', name: 'clang 11', with: { tag: 'clang-11' } }
-      - { uses: './.github/actions/compilers', name: 'clang 10', with: { tag: 'clang-10' } }
-        # llvm-objcopy<=9 doesn't have --wildcard. It compiles, but leaves Rust symbols in libyjit.o.
-      - { uses: './.github/actions/compilers', name: 'clang 9',  with: { tag: 'clang-9',   append_configure: '--disable-yjit' } }
-      - { uses: './.github/actions/compilers', name: 'clang 8',  with: { tag: 'clang-8',   append_configure: '--disable-yjit' } }
-      - { uses: './.github/actions/compilers', name: 'clang 7',  with: { tag: 'clang-7',   append_configure: '--disable-yjit' } }
-      - { uses: './.github/actions/compilers', name: 'clang 6',  with: { tag: 'clang-6.0', append_configure: '--disable-yjit' } }
-
-  compile5:
-    name: 'omnibus compilations, #5'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    timeout-minutes: 60
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      # -Wno-strict-prototypes is necessary with current clang-15 since
-      # older autoconf generate functions without prototype and -pedantic
-      # now implies strict-prototypes. Disabling the error but leaving the
-      # warning generates a lot of noise from use of ANYARGS in
-      # rb_define_method() and friends.
-      # See: https://github.com/llvm/llvm-project/commit/11da1b53d8cd3507959022cd790d5a7ad4573d94
-      - { uses: './.github/actions/compilers', name: 'C99',      with: { CFLAGS: '-std=c99 -Werror=pedantic -pedantic-errors -Wno-strict-prototypes' } }
-      - { uses: './.github/actions/compilers', name: 'C11',   with: { CFLAGS:   '-std=c11   -Werror=pedantic -pedantic-errors -Wno-strict-prototypes' } }
-      - { uses: './.github/actions/compilers', name: 'C17',   with: { CFLAGS:   '-std=c17   -Werror=pedantic -pedantic-errors -Wno-strict-prototypes' } }
-      - { uses: './.github/actions/compilers', name: 'C23',   with: { CFLAGS:   '-std=c2x   -Werror=pedantic -pedantic-errors -Wno-strict-prototypes' } }
-      - { uses: './.github/actions/compilers', name: 'C++98', with: { CXXFLAGS: '-std=c++98 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' } }
-      - { uses: './.github/actions/compilers', name: 'C++11', with: { CXXFLAGS: '-std=c++11 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' } }
-      - { uses: './.github/actions/compilers', name: 'C++14', with: { CXXFLAGS: '-std=c++14 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' } }
-      - { uses: './.github/actions/compilers', name: 'C++17', with: { CXXFLAGS: '-std=c++17 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' } }
-
-  compile6:
-    name: 'omnibus compilations, #6'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    timeout-minutes: 60
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'C++20', with: { CXXFLAGS: '-std=c++20 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' } }
-      - { uses: './.github/actions/compilers', name: 'C++23', with: { CXXFLAGS: '-std=c++23 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' } }
-      - { uses: './.github/actions/compilers', name: 'C++26', with: { CXXFLAGS: '-std=c++26 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' } }
-      - { uses: './.github/actions/compilers', name: 'gmp',                 with: { append_configure: '--with-gmp', check: 'ruby/test_bignum.rb', mspecopt: "/github/workspace/src/spec/ruby/core/integer" } }
-      - { uses: './.github/actions/compilers', name: 'jemalloc',            with: { append_configure: '--with-jemalloc' } }
-      - { uses: './.github/actions/compilers', name: 'valgrind',            with: { append_configure: '--with-valgrind' } }
-      - { uses: './.github/actions/compilers', name: 'coroutine=ucontext',  with: { append_configure: '--with-coroutine=ucontext' } }
-      - { uses: './.github/actions/compilers', name: 'coroutine=pthread',   with: { append_configure: '--with-coroutine=pthread' } }
-
-  compile7:
-    name: 'omnibus compilations, #7'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    timeout-minutes: 60
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'disable-jit',         with: { append_configure: '--disable-yjit --disable-zjit' } }
-      - { uses: './.github/actions/compilers', name: 'disable-yjit',        with: { append_configure: '--disable-yjit' } }
-      - { uses: './.github/actions/compilers', name: 'disable-zjit',        with: { append_configure: '--disable-zjit' } }
-      - { uses: './.github/actions/compilers', name: 'disable-dln',         with: { append_configure: '--disable-dln' } }
-      - { uses: './.github/actions/compilers', name: 'enable-mkmf-verbose', with: { append_configure: '--enable-mkmf-verbose' } }
-      - { uses: './.github/actions/compilers', name: 'disable-rubygems',    with: { append_configure: '--disable-rubygems' } }
-      - { uses: './.github/actions/compilers', name: 'RUBY_DEVEL',          with: { append_configure: '--enable-devel' } }
-      - { uses: './.github/actions/compilers', name: 'OPT_THREADED_CODE=0',            with: { cppflags: '-DOPT_THREADED_CODE=0' } }
-      - { uses: './.github/actions/compilers', name: 'OPT_THREADED_CODE=1',            with: { cppflags: '-DOPT_THREADED_CODE=1' } }
-      - { uses: './.github/actions/compilers', name: 'OPT_THREADED_CODE=2',            with: { cppflags: '-DOPT_THREADED_CODE=2' } }
-
-  compile8:
-    name: 'omnibus compilations, #8'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    timeout-minutes: 60
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'NDEBUG',                         with: { cppflags: '-DNDEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'RUBY_DEBUG',                     with: { cppflags: '-DRUBY_DEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'ARRAY_DEBUG',                    with: { cppflags: '-DARRAY_DEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'BIGNUM_DEBUG',                   with: { cppflags: '-DBIGNUM_DEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'CCAN_LIST_DEBUG',                with: { cppflags: '-DCCAN_LIST_DEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'CPDEBUG=-1',                     with: { cppflags: '-DCPDEBUG=-1' } }
-      - { uses: './.github/actions/compilers', name: 'ENC_DEBUG',                      with: { cppflags: '-DENC_DEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'GC_DEBUG',                       with: { cppflags: '-DGC_DEBUG' } }
-
-  compile9:
-    name: 'omnibus compilations, #9'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    timeout-minutes: 60
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'HASH_DEBUG',                     with: { cppflags: '-DHASH_DEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'ID_TABLE_DEBUG',                 with: { cppflags: '-DID_TABLE_DEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'RGENGC_DEBUG=-1',                with: { cppflags: '-DRGENGC_DEBUG=-1' } }
-      - { uses: './.github/actions/compilers', name: 'SYMBOL_DEBUG',                   with: { cppflags: '-DSYMBOL_DEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'RGENGC_CHECK_MODE',              with: { cppflags: '-DRGENGC_CHECK_MODE' } }
-      - { uses: './.github/actions/compilers', name: 'VM_CHECK_MODE',                  with: { cppflags: '-DVM_CHECK_MODE' } }
-      - { uses: './.github/actions/compilers', name: 'USE_EMBED_CI=0',                 with: { cppflags: '-DUSE_EMBED_CI=0' } }
-      - { uses: './.github/actions/compilers', name: 'USE_FLONUM=0',                   with: { cppflags: '-DUSE_FLONUM=0', append_configure: '--disable-yjit' } }
-
-  compileX:
-    name: 'omnibus compilations, #10'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    timeout-minutes: 60
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'USE_LAZY_LOAD',                  with: { cppflags: '-DUSE_LAZY_LOAD' } }
-      - { uses: './.github/actions/compilers', name: 'USE_SYMBOL_GC=0',                with: { cppflags: '-DUSE_SYMBOL_GC=0' } }
-      - { uses: './.github/actions/compilers', name: 'USE_THREAD_CACHE=0',             with: { cppflags: '-DUSE_THREAD_CACHE=0' } }
-      - { uses: './.github/actions/compilers', name: 'USE_RUBY_DEBUG_LOG=1',           with: { cppflags: '-DUSE_RUBY_DEBUG_LOG=1' } }
-      - { uses: './.github/actions/compilers', name: 'USE_DEBUG_COUNTER',              with: { cppflags: '-DUSE_DEBUG_COUNTER=1' } }
-      - { uses: './.github/actions/compilers', name: 'SHARABLE_MIDDLE_SUBSTRING',      with: { cppflags: '-DSHARABLE_MIDDLE_SUBSTRING=1' } }
-      - { uses: './.github/actions/compilers', name: 'DEBUG_FIND_TIME_NUMGUESS',       with: { cppflags: '-DDEBUG_FIND_TIME_NUMGUESS' } }
-      - { uses: './.github/actions/compilers', name: 'DEBUG_INTEGER_PACK',             with: { cppflags: '-DDEBUG_INTEGER_PACK' } }
-
-  compileB:
-    name: 'omnibus compilations, #11'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    timeout-minutes: 60
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'GC_DEBUG_STRESS_TO_CLASS',       with: { cppflags: '-DGC_DEBUG_STRESS_TO_CLASS' } }
-      - { uses: './.github/actions/compilers', name: 'GC_ENABLE_LAZY_SWEEP=0',         with: { cppflags: '-DGC_ENABLE_LAZY_SWEEP=0' } }
-      - { uses: './.github/actions/compilers', name: 'GC_PROFILE_DETAIL_MEMORY',       with: { cppflags: '-DGC_PROFILE_DETAIL_MEMORY' } }
-      - { uses: './.github/actions/compilers', name: 'GC_PROFILE_MORE_DETAIL',         with: { cppflags: '-DGC_PROFILE_MORE_DETAIL' } }
-      - { uses: './.github/actions/compilers', name: 'MALLOC_ALLOCATED_SIZE_CHECK',    with: { cppflags: '-DMALLOC_ALLOCATED_SIZE_CHECK' } }
-      - { uses: './.github/actions/compilers', name: 'RGENGC_ESTIMATE_OLDMALLOC',      with: { cppflags: '-DRGENGC_ESTIMATE_OLDMALLOC' } }
-      - { uses: './.github/actions/compilers', name: 'RGENGC_OBJ_INFO',                with: { cppflags: '-DRGENGC_OBJ_INFO' } }
-      - { uses: './.github/actions/compilers', name: 'RGENGC_PROFILE',                 with: { cppflags: '-DRGENGC_PROFILE' } }
-
-  compileC:
-    name: 'omnibus compilations, #12'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    timeout-minutes: 60
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'VM_DEBUG_BP_CHECK',              with: { cppflags: '-DVM_DEBUG_BP_CHECK' } }
-      - { uses: './.github/actions/compilers', name: 'VM_DEBUG_VERIFY_METHOD_CACHE',   with: { cppflags: '-DVM_DEBUG_VERIFY_METHOD_CACHE' } }
-      - { uses: './.github/actions/compilers', name: 'enable-yjit',                    with: { append_configure: '--enable-yjit' } }
-      - { uses: './.github/actions/compilers', name: 'enable-{y,z}jit',                with: { append_configure: '--enable-yjit --enable-zjit' } }
-      - { uses: './.github/actions/compilers', name: 'enable-{y,z}jit=dev',            with: { append_configure: '--enable-yjit=dev --enable-zjit' } }
-      - { uses: './.github/actions/compilers', name: 'YJIT_FORCE_ENABLE',              with: { cppflags: '-DYJIT_FORCE_ENABLE' } }
-      - { uses: './.github/actions/compilers', name: 'UNIVERSAL_PARSER',               with: { cppflags: '-DUNIVERSAL_PARSER' } }
-
-  compilemax:
-    name: 'omnibus compilations, result'
-    runs-on: ubuntu-latest
-    if: ${{ always() }}
-    needs:
-      - 'compile1'
-      - 'compile2'
-      - 'compile3'
-      - 'compile4'
-      - 'compile5'
-      - 'compile6'
-      - 'compile7'
-      - 'compile8'
-      - 'compile9'
-      - 'compileX'
-      - 'compileB'
-      - 'compileC'
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - uses: ./.github/actions/slack
-        with:
-          label: 'omnibus'
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
-      - run: false
-        working-directory:
-        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
-
-defaults:
-  run:
-    working-directory: build
diff --git a/.github/workflows/cygwin.yml b/.github/workflows/cygwin.yml
deleted file mode 100644
index d822a2e9e2..0000000000
--- a/.github/workflows/cygwin.yml
+++ /dev/null
@@ -1,67 +0,0 @@
-name: Cygwin
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  make:
-    runs-on: windows-2022
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    steps:
-      - run: git config --global core.autocrlf input
-
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-
-      - name: Setup Cygwin
-        uses: cygwin/cygwin-install-action@master
-        with:
-          packages: ruby gcc-core make autoconf libtool libssl-devel libyaml-devel libffi-devel zlib-devel
-
-      - name: configure
-        run: |
-          ./autogen.sh
-          ./configure --disable-install-doc
-        shell: C:\cygwin\bin\bash.EXE --noprofile --norc -e -o igncr -o pipefail {0}
-
-      - name: Extract bundled gems
-        run: |
-          make ruby -j5
-          make extract-gems
-        shell: C:\cygwin\bin\bash.EXE --noprofile --norc -e -o igncr -o pipefail {0}
-
-      - name: make all
-        timeout-minutes: 30
-        run: make -j4 V=1
-        shell: C:\cygwin\bin\bash.EXE --noprofile --norc -e -o igncr -o pipefail {0}
diff --git a/.github/workflows/default_gems.yml b/.github/workflows/default_gems.yml
deleted file mode 100644
index cd15e34229..0000000000
--- a/.github/workflows/default_gems.yml
+++ /dev/null
@@ -1,96 +0,0 @@
-name: Update default gems list
-on: [push, pull_request, merge_group]
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  update_default_gems:
-    name: Update default gems list
-
-    permissions:
-      contents: write # for Git to git push
-
-    runs-on: ubuntu-latest
-
-    if: ${{ github.repository == 'ruby/ruby' }}
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          token: ${{ (github.repository == 'ruby/ruby' && !startsWith(github.event_name, 'pull')) && secrets.MATZBOT_AUTO_UPDATE_TOKEN || secrets.GITHUB_TOKEN }}
-
-      - id: gems
-        run: true
-        if: ${{ github.ref == 'refs/heads/master' }}
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          makeup: true
-          # Skip overwriting MATZBOT_AUTO_UPDATE_TOKEN
-          checkout: '' # false (ref: https://github.com/actions/runner/issues/2238)
-        if: ${{ steps.gems.outcome == 'success' }}
-
-      - name: Download previous gems list
-        run: |
-          data=default_gems.json
-          mkdir -p .downloaded-cache
-          ln -s .downloaded-cache/$data .
-          curl -O -R -z ./$data https://stdgems.org/$data
-        if: ${{ steps.gems.outcome == 'success' }}
-
-      - name: Make default gems list
-        run: |
-          #!ruby
-          require 'rubygems'
-          $:.unshift "lib"
-          rgver = File.foreach("lib/rubygems.rb") do |line|
-            break $1 if /^\s*VERSION\s*=\s*"([^"]+)"/ =~ line
-          end
-          gems = Dir.glob("{ext,lib}/**/*.gemspec").map do |f|
-            spec = Gem::Specification.load(f)
-            "#{spec.name} #{spec.version}"
-          end.sort
-          File.open("gems/default_gems", "w") do |f|
-            f.puts "RubyGems #{rgver}"
-            f.puts gems
-          end
-        shell: ruby --disable=gems {0}
-        if: ${{ steps.gems.outcome == 'success' }}
-
-      - name: Maintain updated gems list in NEWS
-        run: |
-          ruby tool/update-NEWS-gemlist.rb default
-        if: ${{ steps.gems.outcome == 'success' }}
-
-      - name: Check diffs
-        id: diff
-        run: |
-          git diff --color --no-ext-diff --ignore-submodules --exit-code NEWS.md ||
-          echo update=true >> $GITHUB_OUTPUT
-        if: ${{ steps.gems.outcome == 'success' }}
-
-      - name: Commit
-        run: |
-          git pull --ff-only origin ${GITHUB_REF#refs/heads/}
-          git commit --message="Update default gems list at ${GITHUB_SHA:0:30} [ci skip]" NEWS.md
-          git push origin ${GITHUB_REF#refs/heads/}
-        env:
-          EMAIL: svn-admin@ruby-lang.org
-          GIT_AUTHOR_NAME: git
-          GIT_COMMITTER_NAME: git
-        if: >-
-          ${{
-          github.repository == 'ruby/ruby' &&
-          !startsWith(github.event_name, 'pull') &&
-          steps.diff.outputs.update
-          }}
-
-      - uses: ./.github/actions/slack
-        with:
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
diff --git a/.github/workflows/dependabot_automerge.yml b/.github/workflows/dependabot_automerge.yml
deleted file mode 100644
index 2d2427a907..0000000000
--- a/.github/workflows/dependabot_automerge.yml
+++ /dev/null
@@ -1,32 +0,0 @@
-# from https://github.com/gofiber/swagger/blob/main/.github/workflows/dependabot_automerge.yml
-name: Dependabot auto-merge
-on:
-  pull_request:
-
-permissions:
-  contents: write
-  pull-requests: write
-
-jobs:
-  automerge:
-    runs-on: ubuntu-latest
-    if: github.event.pull_request.user.login == 'dependabot[bot]' && github.repository == 'ruby/ruby'
-    steps:
-      - name: Dependabot metadata
-        uses: dependabot/fetch-metadata@08eff52bf64351f401fb50d4972fa95b9f2c2d1b # v2.4.0
-        id: metadata
-
-      - name: Wait for status checks
-        uses: lewagon/wait-on-check-action@31f07a800aa1ba8518509dc8561cdf5a891deb4b # v1.4.0
-        with:
-          repo-token: ${{ secrets.GITHUB_TOKEN }}
-          ref: ${{ github.event.pull_request.head.sha || github.sha }}
-          check-regexp: 'make \(check, .*\)'
-          wait-interval: 30
-
-      - name: Auto-merge for Dependabot PRs
-        if: ${{ steps.metadata.outputs.update-type == 'version-update:semver-minor' || steps.metadata.outputs.update-type == 'version-update:semver-patch' }}
-        run: gh pr merge --auto --rebase "$PR_URL"
-        env:
-          PR_URL: ${{ github.event.pull_request.html_url }}
-          GITHUB_TOKEN: ${{ secrets.MATZBOT_DEPENDABOT_MERGE_TOKEN }}
diff --git a/.github/workflows/labeler.yml b/.github/workflows/labeler.yml
deleted file mode 100644
index e57cd86e2b..0000000000
--- a/.github/workflows/labeler.yml
+++ /dev/null
@@ -1,12 +0,0 @@
-name: "Pull Request Labeler"
-on:
-- pull_request_target
-
-jobs:
-  labeler:
-    permissions:
-      contents: read
-      pull-requests: write
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/labeler@v5
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
deleted file mode 100644
index bf5f5cd413..0000000000
--- a/.github/workflows/macos.yml
+++ /dev/null
@@ -1,198 +0,0 @@
-name: macOS
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    # Do not use paths-ignore for required status checks
-    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  make:
-    strategy:
-      matrix:
-        include:
-          - test_task: check
-            os: macos-14
-          - test_task: check
-            os: macos-14
-            configure_args: '--with-gcc=gcc-14'
-          - test_task: check
-            os: macos-14
-            configure_args: '--with-jemalloc --with-opt-dir=$(brew --prefix jemalloc)'
-          - test_task: check
-            os: macos-14
-            configure_args: '--with-gmp'
-          - test_task: test-all
-            test_opts: --repeat-count=2
-            os: macos-14
-          - test_task: test-bundler-parallel
-            os: macos-14
-          - test_task: test-bundled-gems
-            os: macos-14
-          - test_task: check
-            os: macos-15
-          - test_task: check
-            os: macos-13
-      fail-fast: false
-
-    env:
-      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
-
-    runs-on: ${{ matrix.os }}
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          sparse-checkout-cone-mode: false
-          sparse-checkout: /.github
-
-      - name: Install libraries
-        uses: ./.github/actions/setup/macos
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          srcdir: src
-          builddir: build
-          makeup: true
-          clean: true
-          dummy-files: ${{ matrix.test_task == 'check' }}
-          # Set fetch-depth: 0 so that Launchable can receive commits information.
-          fetch-depth: 10
-
-      - name: make sure that kern.coredump=1
-        run: |
-          sysctl -n kern.coredump
-          sudo sysctl -w kern.coredump=1
-          sudo chmod -R +rwx /cores/
-
-      - name: Delete unused SDKs
-        # To free up disk space to not run out during the run
-        run: |
-          sudo rm -rf ~/.dotnet
-          sudo rm -rf /Library/Android
-          sudo rm -rf /Library/Developer/CoreSimulator
-        continue-on-error: true
-
-      - name: Run configure
-        run: ../src/configure -C --disable-install-doc ${ruby_configure_args} ${{ matrix.configure_args }}
-
-      - run: make prepare-gems
-        if: ${{ matrix.test_task == 'test-bundled-gems' }}
-
-      - run: make
-
-      - run: make hello
-
-      - name: runirb
-        run: |
-          echo IRB::VERSION | make runirb RUNOPT="-- -f"
-
-      - name: Set test options for skipped tests
-        run: |
-          set -x
-          TESTS="$(echo "${{ matrix.skipped_tests }}" | sed 's| |$$/ -n!/|g;s|^|-n!/|;s|$|$$/|')"
-          echo "TESTS=${TESTS}" >> $GITHUB_ENV
-        if: ${{ matrix.test_task == 'check' && matrix.skipped_tests }}
-
-      - name: Set up Launchable
-        id: launchable
-        uses: ./.github/actions/launchable/setup
-        with:
-          os: ${{ matrix.os }}
-          test-opts: ${{ matrix.test_opts }}
-          launchable-token: ${{ secrets.LAUNCHABLE_TOKEN }}
-          builddir: build
-          srcdir: src
-        continue-on-error: true
-        timeout-minutes: 3
-
-      - name: Set extra test options
-        run: |
-          echo "TESTS=$TESTS ${{ matrix.test_opts }}" >> $GITHUB_ENV
-          echo "RUBY_TEST_TIMEOUT_SCALE=10" >> $GITHUB_ENV # With --repeat-count=2, flaky test by timeout occurs frequently for some reason
-        if: matrix.test_opts
-
-      - name: make ${{ matrix.test_task }}
-        run: |
-          test -n "${LAUNCHABLE_STDOUT}" && exec 1> >(tee "${LAUNCHABLE_STDOUT}")
-          test -n "${LAUNCHABLE_STDERR}" && exec 2> >(tee "${LAUNCHABLE_STDERR}")
-
-          ulimit -c unlimited
-          make -s ${{ matrix.test_task }} ${TESTS:+TESTS="$TESTS"}
-        timeout-minutes: 60
-        env:
-          RUBY_TESTOPTS: '-q --tty=no'
-          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ''
-          PRECHECK_BUNDLED_GEMS: 'no'
-          LAUNCHABLE_STDOUT: ${{ steps.launchable.outputs.stdout_report_path }}
-          LAUNCHABLE_STDERR: ${{ steps.launchable.outputs.stderr_report_path }}
-
-      - name: make skipped tests
-        run: |
-          make -s test-all TESTS="${TESTS//-n!\//-n/}"
-        env:
-          GNUMAKEFLAGS: ''
-          RUBY_TESTOPTS: '-v --tty=no'
-          PRECHECK_BUNDLED_GEMS: 'no'
-        if: ${{ matrix.test_task == 'check' && matrix.skipped_tests }}
-        continue-on-error: ${{ matrix.continue-on-skipped_tests || false }}
-
-      - uses: ./.github/actions/slack
-        with:
-          label: ${{ matrix.os }} / ${{ matrix.test_task }}
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
-
-      - name: Resolve job ID
-        id: job_id
-        uses: actions/github-script@main
-        env:
-          matrix: ${{ toJson(matrix) }}
-        with:
-          script: |
-            const { data: workflow_run } = await github.rest.actions.listJobsForWorkflowRun({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              run_id: context.runId
-            });
-            const matrix = JSON.parse(process.env.matrix);
-            const job_name = `${context.job}${matrix ? ` (${Object.values(matrix).join(", ")})` : ""}`;
-            return workflow_run.jobs.find((job) => job.name === job_name).id;
-
-  result:
-    if: ${{ always() }}
-    name: ${{ github.workflow }} result
-    runs-on: macos-latest
-    needs: [make]
-    steps:
-      - run: exit 1
-        working-directory:
-        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
-
-defaults:
-  run:
-    working-directory: build
diff --git a/.github/workflows/mingw.yml b/.github/workflows/mingw.yml
deleted file mode 100644
index 1c4cb533d3..0000000000
--- a/.github/workflows/mingw.yml
+++ /dev/null
@@ -1,223 +0,0 @@
-name: MinGW
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-# Notes:
-# Actions console encoding causes issues, see test-all & test-spec steps
-#
-jobs:
-  make:
-    runs-on: windows-2022
-
-    name: ${{ github.workflow }} (${{ matrix.msystem }})
-
-    env:
-      MSYSTEM: ${{ matrix.msystem }}
-      MSYS2_ARCH: x86_64
-      CHOST: 'x86_64-w64-mingw32'
-      CFLAGS: '-march=x86-64 -mtune=generic -O3 -pipe'
-      CXXFLAGS: '-march=x86-64 -mtune=generic -O3 -pipe'
-      CPPFLAGS: '-D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048'
-      LDFLAGS: '-pipe'
-      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
-
-    strategy:
-      matrix:
-        include:
-          # To mitigate flakiness of MinGW CI, we test only one runtime that newer MSYS2 uses.
-          # Ruby 3.2 is the first Windows Ruby to use OpenSSL 3.x
-          - msystem: 'UCRT64'
-            test_task: 'check'
-            test-all-opts: '--name=!/TestObjSpace#test_reachable_objects_during_iteration/'
-      fail-fast: false
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    steps:
-      - uses: msys2/setup-msys2@40677d36a502eb2cf0fb808cc9dec31bf6152638 # v2.28.0
-        id: msys2
-        with:
-          msystem: UCRT64
-          update: true
-          install: >-
-            git
-            make
-            ruby
-            autoconf
-            mingw-w64-ucrt-x86_64-gcc
-            mingw-w64-ucrt-x86_64-ragel
-            mingw-w64-ucrt-x86_64-openssl
-            mingw-w64-ucrt-x86_64-libyaml
-            mingw-w64-ucrt-x86_64-libffi
-
-      - name: Set up env
-        id: setup-env
-        working-directory:
-        run: |
-          $msys2 = ${env:MSYS2_LOCATION}
-          echo $msys2\usr\bin $msys2\ucrt64\bin |
-            Tee-Object ${env:GITHUB_PATH} -Append -Encoding utf-8
-
-          # Use the fast device for the temporary directory.
-          # %TEMP% is inconsistent with %TMP% and test-all expects they are consistent.
-          # https://github.com/actions/virtual-environments/issues/712#issuecomment-613004302
-          $tmp = ${env:RUNNER_TEMP}
-          echo HOME=$home TMP=$tmp TEMP=$tmp TMPDIR=$tmp |
-            Tee-Object ${env:GITHUB_ENV} -Append -Encoding utf-8
-        shell: pwsh             # cmd.exe does not strip spaces before `|`.
-        env:
-          MSYS2_LOCATION: ${{ steps.msys2.outputs.msys2-location }}
-
-      - name: Remove Strawberry Perl pkg-config
-        working-directory:
-        # `pkg-config.bat` included in Strawberry Perl is written in
-        # Perl and doesn't work when another msys2 `perl` precede its
-        # own `perl`.
-        #
-        # ```
-        # Can't find C:\Strawberry\perl\bin\pkg-config.bat on PATH, '.' not in PATH.
-        # ```
-        run: |
-          Get-Command pkg-config.bat | % { ren $_.path ($_.path + "~") }
-        shell: pwsh
-
-      - name: Misc system & package info
-        working-directory:
-        run: |
-          group() { echo ::group::$'\e[94;1m'"$*"$'\e[m'; }
-          endgroup() { echo ::endgroup::; }
-
-          group Path
-          cygpath -wa / . $(type -p cygpath bash sh)
-          endgroup
-
-          I() {
-              group $1
-              run Where type -pa $1 && { [ $# -eq 1 ] || run Version "$@"; } ||
-                  failed+=($1)
-              endgroup
-          }
-          run() { local w m=$1; shift; w="$("$@")" && show "$m" && indent "$w"; }
-          indent() { [ -z "$1" ] || echo "$1" | /bin/sed '/^$/!s/^/  /'; }
-          show() { echo $'\e[96m'"$*"$'\e[m'; }
-
-          failed=()
-
-          I gcc.exe --version
-          I ragel.exe --version
-          I make.exe --version
-          I openssl.exe version
-          I libcrypto-3-x64.dll
-          I libssl-3-x64.dll
-
-          group Packages
-          pacman -Qs mingw-w64-ucrt-x86_64-* | /bin/sed -n "s,local/mingw-w64-ucrt-x86_64-,,p"
-          endgroup
-
-          [ ${#failed[@]} -eq 0 ]
-        shell: sh
-
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          sparse-checkout-cone-mode: false
-          sparse-checkout: /.github
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          srcdir: src
-          builddir: build
-          makeup: true
-          # Set fetch-depth: 10 so that Launchable can receive commits information.
-          fetch-depth: 10
-
-      - name: configure
-        run: >
-          ../src/configure --disable-install-doc --prefix=/.
-          --build=$CHOST --host=$CHOST --target=$CHOST
-        shell: sh
-
-      - name: make all
-        timeout-minutes: 30
-        run: make -j4
-
-      - name: make install
-        run: make DESTDIR=../install install-nodoc
-
-      - name: Set up Launchable
-        uses: ./.github/actions/launchable/setup
-        with:
-          os: windows-2022
-          launchable-token: ${{ secrets.LAUNCHABLE_TOKEN }}
-          builddir: build
-          srcdir: src
-          test-tasks: '["test", "test-all", "test-spec"]'
-        continue-on-error: true
-        timeout-minutes: 3
-
-      - name: test
-        timeout-minutes: 30
-        run: make test
-        env:
-          GNUMAKEFLAGS: ''
-          RUBY_TESTOPTS: '-v --tty=no'
-        if: ${{ matrix.test_task == 'check' || matrix.test_task == 'test' }}
-
-      - name: test-all
-        timeout-minutes: 45
-        run: |
-          make ${{ StartsWith(matrix.test_task, 'test/') && matrix.test_task || 'test-all' }}
-        env:
-          RUBY_TESTOPTS: >-
-            --retry --job-status=normal --show-skip --timeout-scale=1.5 -j4
-            ${{ matrix.test-all-opts }}
-            ${{ env.TESTS }}
-          BUNDLER_VERSION:
-        if: ${{ matrix.test_task == 'check' || matrix.test_task == 'test-all' || StartsWith(matrix.test_task, 'test/') }}
-
-      - name: test-spec
-        timeout-minutes: 10
-        run: |
-          make ${{ StartsWith(matrix.test_task, 'spec/') && matrix.test_task || 'test-spec' }}
-        if: ${{ matrix.test_task == 'check' || matrix.test_task == 'test-spec' || StartsWith(matrix.test_task, 'spec/') }}
-
-      - uses: ./src/.github/actions/slack
-        with:
-          label: ${{ matrix.msystem }} / ${{ matrix.test_task }}
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
-
-defaults:
-  run:
-    working-directory: build
-    shell: cmd
diff --git a/.github/workflows/modgc.yml b/.github/workflows/modgc.yml
deleted file mode 100644
index fe10979a5f..0000000000
--- a/.github/workflows/modgc.yml
+++ /dev/null
@@ -1,178 +0,0 @@
-name: ModGC
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    # Do not use paths-ignore for required status checks
-    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  check:
-    strategy:
-      matrix:
-        gc:
-          - name: default
-          - name: mmtk
-            mmtk_build: release
-        os: [macos-latest, ubuntu-latest]
-        include:
-          - test_task: check
-      fail-fast: false
-
-    env:
-      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
-      RUBY_DEBUG: ci
-
-    runs-on: ${{ matrix.os }}
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          sparse-checkout-cone-mode: false
-          sparse-checkout: /.github
-
-      - name: Install libraries (macOS)
-        uses: ./.github/actions/setup/macos
-        if: ${{ contains(matrix.os, 'macos') }}
-
-      - name: Install libraries (Ubuntu)
-        uses: ./.github/actions/setup/ubuntu
-        if: ${{ contains(matrix.os, 'ubuntu') }}
-
-      - uses: ruby/setup-ruby@a9bfc2ecf3dd40734a9418f89a7e9d484c32b990 # v1.248.0
-        with:
-          ruby-version: '3.1'
-          bundler: none
-        if: ${{ contains(matrix.os, 'ubuntu') }}
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          srcdir: src
-          builddir: build
-          makeup: true
-          clean: true
-          dummy-files: false
-          # Set fetch-depth: 10 so that Launchable can receive commits information.
-          fetch-depth: 10
-
-      - name: make sure that kern.coredump=1
-        run: |
-          sysctl -n kern.coredump
-          sudo sysctl -w kern.coredump=1
-          sudo chmod -R +rwx /cores/
-        if: ${{ contains(matrix.os, 'macos') }}
-
-      - name: Delete unused SDKs
-        # To free up disk space to not run out during the run
-        run: |
-          sudo rm -rf ~/.dotnet
-          sudo rm -rf /Library/Android
-          sudo rm -rf /Library/Developer/CoreSimulator
-        continue-on-error: true
-        if: ${{ contains(matrix.os, 'macos') }}
-
-      - name: Setup Ruby GC Directory
-        run: |
-          echo "MODULAR_GC_DIR=$HOME/ruby_gc" >> $GITHUB_ENV
-
-      - name: Run configure
-        env:
-          arch: ${{ matrix.arch }}
-        run: >-
-          $SETARCH ../src/configure -C --disable-install-doc --with-modular-gc=${{ env.MODULAR_GC_DIR }}
-          ${arch:+--target=$arch-$OSTYPE --host=$arch-$OSTYPE}
-
-      - uses: actions-rust-lang/setup-rust-toolchain@v1
-      - name: Set MMTk environment variables
-        run: |
-          echo 'EXCLUDES=../src/test/.excludes-mmtk' >> $GITHUB_ENV
-          echo 'MSPECOPT=-B../src/spec/mmtk.mspec' >> $GITHUB_ENV
-        if: ${{ matrix.gc.name == 'mmtk' }}
-
-      - run: $SETARCH make
-
-      - name: Build Modular  GC
-        run: |
-          echo "RUBY_GC_LIBRARY=${{ matrix.gc.name }}" >> $GITHUB_ENV
-          make install-modular-gc MODULAR_GC=${{ matrix.gc.name }} MMTK_BUILD=${{ matrix.gc.mmtk_build }}
-          make distclean-modular-gc MODULAR_GC=${{ matrix.gc.name }}
-
-      - run: $SETARCH make hello
-
-      - name: Set test options for skipped tests
-        run: |
-          set -x
-          TESTS="$(echo "${{ matrix.skipped_tests }}" | sed 's| |$$/ -n!/|g;s|^|-n!/|;s|$|$$/|')"
-          echo "TESTS=${TESTS}" >> $GITHUB_ENV
-        if: ${{ matrix.test_task == 'check' && matrix.skipped_tests }}
-
-      - name: Set up Launchable
-        id: launchable
-        uses: ./.github/actions/launchable/setup
-        with:
-          os: ${{ matrix.os || 'ubuntu-22.04' }}
-          test-opts: ${{ matrix.configure }}
-          launchable-token: ${{ secrets.LAUNCHABLE_TOKEN }}
-          builddir: build
-          srcdir: src
-        continue-on-error: true
-        timeout-minutes: 3
-
-      - name: make ${{ matrix.test_task }}
-        run: |
-          test -n "${LAUNCHABLE_STDOUT}" && exec 1> >(tee "${LAUNCHABLE_STDOUT}")
-          test -n "${LAUNCHABLE_STDERR}" && exec 2> >(tee "${LAUNCHABLE_STDERR}")
-
-          $SETARCH make -s ${{ matrix.test_task }} \
-            ${TESTS:+TESTS="$TESTS"} \
-            ${{ !contains(matrix.test_task, 'bundle') && 'RUBYOPT=-w' || '' }}
-        timeout-minutes: ${{ matrix.gc.timeout || 40 }}
-        env:
-          RUBY_TESTOPTS: '-q --tty=no'
-          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ''
-          PRECHECK_BUNDLED_GEMS: 'no'
-          LAUNCHABLE_STDOUT: ${{ steps.launchable.outputs.stdout_report_path }}
-          LAUNCHABLE_STDERR: ${{ steps.launchable.outputs.stderr_report_path }}
-
-      - name: make skipped tests
-        run: |
-          $SETARCH make -s test-all TESTS="${TESTS//-n!\//-n/}"
-        env:
-          GNUMAKEFLAGS: ''
-          RUBY_TESTOPTS: '-v --tty=no'
-        if: ${{ matrix.test_task == 'check' && matrix.skipped_tests }}
-        continue-on-error: ${{ matrix.continue-on-skipped_tests || false }}
-
-      - uses: ./.github/actions/slack
-        with:
-          label: ${{ matrix.test_task }} ${{ matrix.configure }}${{ matrix.arch }}
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
-
-defaults:
-  run:
-    working-directory: build
diff --git a/.github/workflows/parse_y.yml b/.github/workflows/parse_y.yml
deleted file mode 100644
index c77b4516d1..0000000000
--- a/.github/workflows/parse_y.yml
+++ /dev/null
@@ -1,102 +0,0 @@
-name: parse.y
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  make:
-    strategy:
-      matrix:
-        include:
-          - test_task: check
-          - test_task: test-bundler-parallel
-          - test_task: test-bundled-gems
-      fail-fast: false
-
-    env:
-      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
-      RUBY_DEBUG: ci
-      SETARCH: ${{ matrix.arch && format('setarch {0}', matrix.arch) }}
-
-    runs-on: ubuntu-22.04
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          sparse-checkout-cone-mode: false
-          sparse-checkout: /.github
-
-      - uses: ./.github/actions/setup/ubuntu
-
-      - uses: ruby/setup-ruby@a9bfc2ecf3dd40734a9418f89a7e9d484c32b990 # v1.248.0
-        with:
-          ruby-version: '3.1'
-          bundler: none
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          srcdir: src
-          builddir: build
-          makeup: true
-          clean: true
-          dummy-files: ${{ matrix.test_task == 'check' }}
-
-      - name: Run configure
-        run: ../src/configure -C --disable-install-doc cppflags=-DRUBY_DEBUG --with-parser=parse.y
-
-      - run: make
-
-      - run: make TESTRUN_SCRIPT='-renvutil -v -e "exit EnvUtil.current_parser == %[parse.y]"' run
-        env:
-          RUNOPT0: -I$(tooldir)/lib
-
-      - name: make ${{ matrix.test_task }}
-        run: make -s ${{ matrix.test_task }} RUN_OPTS="$RUN_OPTS" SPECOPTS="$SPECOPTS"
-        env:
-          RUBY_TESTOPTS: ${{ matrix.testopts }}
-          EXCLUDES: '../src/test/.excludes-parsey'
-          RUN_OPTS: ${{ matrix.run_opts || '--parser=parse.y' }}
-          SPECOPTS: ${{ matrix.specopts || '-T --parser=parse.y' }}
-          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ''
-
-      - uses: ./.github/actions/slack
-        with:
-          label: ${{ matrix.run_opts }}
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
-
-defaults:
-  run:
-    working-directory: build
diff --git a/.github/workflows/pr-playground.yml b/.github/workflows/pr-playground.yml
deleted file mode 100644
index cc06006142..0000000000
--- a/.github/workflows/pr-playground.yml
+++ /dev/null
@@ -1,127 +0,0 @@
-name: Post Playground link to PR
-on:
-  pull_request_target:
-    types: [labeled]
-  workflow_run:
-    workflows: ["WebAssembly"]
-    types: [completed]
-
-jobs:
-  post-summary:
-    name: Post Playground link
-    runs-on: ubuntu-latest
-    permissions:
-      pull-requests: write
-    # Post a comment only if the PR status check is passed and the PR is labeled with `Playground`.
-    # Triggered twice: when the PR is labeled and when PR build is passed.
-    if: >-
-      ${{ false
-      || (true
-        && github.event_name == 'pull_request_target'
-        && contains(github.event.pull_request.labels.*.name, 'Playground'))
-      || (true
-        && github.event_name == 'workflow_run'
-        && github.event.workflow_run.conclusion == 'success'
-        && github.event.workflow_run.event == 'pull_request')
-      }}
-    steps:
-      - uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          script: |
-            const fs = require('fs/promises');
-
-            const buildWorkflowPath = '.github/workflows/wasm.yml';
-            const findSuccessfuBuildRun = async (pr) => {
-              const opts = github.rest.actions.listWorkflowRunsForRepo.endpoint.merge({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                status: 'success',
-                branch: pr.head.ref,
-              });
-              const runs = await github.paginate(opts);
-              const buildRun = runs.find(run => run.path == buildWorkflowPath);
-              return buildRun;
-            }
-
-            const postComment = async (body, pr) => {
-              const { data: comments } = await github.rest.issues.listComments({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                issue_number: pr.number,
-              });
-
-              const commentOpts = { owner: context.repo.owner, repo: context.repo.repo, body: comment };
-
-              const existingComment = comments.find(comment => comment.body.startsWith(magicComment));
-              if (existingComment) {
-                core.info(`Updating existing comment: ${existingComment.html_url}`);
-                await github.rest.issues.updateComment({
-                  ...commentOpts, comment_id: existingComment.id
-                });
-              } else {
-                await github.rest.issues.createComment({
-                  ...commentOpts, issue_number: pr.number
-                });
-              }
-            }
-
-            const derivePRNumber = async () => {
-              if (context.payload.pull_request) {
-                return context.payload.pull_request.number;
-              }
-              // Workaround for https://github.com/orgs/community/discussions/25220
-
-              const { data: { artifacts } } = await github.rest.actions.listWorkflowRunArtifacts({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                run_id: context.payload.workflow_run.id,
-              });
-              const artifact = artifacts.find(artifact => artifact.name == 'github-pr-info');
-              if (!artifact) {
-                throw new Error('Cannot find github-pr-info.txt artifact');
-              }
-
-              const { data } = await github.rest.actions.downloadArtifact({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                artifact_id: artifact.id,
-                archive_format: 'zip',
-              });
-
-              await fs.writeFile('pr-info.zip', Buffer.from(data));
-              await exec.exec('unzip', ['pr-info.zip']);
-              return await fs.readFile('github-pr-info.txt', 'utf8');
-            }
-
-            const prNumber = await derivePRNumber();
-
-            const { data: pr } = await github.rest.pulls.get({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              pull_number: prNumber,
-            });
-
-            core.info(`Checking if the PR ${prNumber} is labeled with Playground...`);
-            if (!pr.labels.some(label => label.name == 'Playground')) {
-              core.info(`The PR is not labeled with Playground.`);
-              return;
-            }
-
-            core.info(`Checking if the build is successful for ${pr.head.ref} in ${pr.head.repo.owner.login}/${pr.head.repo.name}...`);
-            const buildRun = await findSuccessfuBuildRun(pr);
-            if (!buildRun) {
-              core.info(`No successful build run found for ${buildWorkflowPath} on ${pr.head.ref} yet.`);
-              return;
-            }
-            core.info(`Found a successful build run: ${buildRun.html_url}`);
-
-            const runLink = `${process.env.GITHUB_SERVER_URL}/${process.env.GITHUB_REPOSITORY}/actions/runs/${process.env.GITHUB_RUN_ID}`;
-            const magicComment = `<!-- AUTO-GENERATED-COMMENT-PR-PLAYGROUND -->`;
-            const comment = `${magicComment}
-            **Try on Playground**: https://ruby.github.io/play-ruby?run=${buildRun.id}
-            This is an automated comment by [\`pr-playground.yml\`](${runLink}) workflow.
-            `;
-            core.info(`Comment: ${comment}`);
-            await postComment(comment, pr);
-
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
deleted file mode 100644
index 5d4474d978..0000000000
--- a/.github/workflows/publish.yml
+++ /dev/null
@@ -1,18 +0,0 @@
-name: Start release workflow
-on:
-  push:
-    tags:
-      - '*'
-
-jobs:
-  notify:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Build release package
-        run: |
-          curl -L -X POST \
-            -H "Authorization: Bearer ${{ secrets.MATZBOT_GITHUB_WORKFLOW_TOKEN }}" \
-            -H "Accept: application/vnd.github+json" \
-            -H "X-GitHub-Api-Version: 2022-11-28" \
-            https://api.github.com/repos/ruby/actions/dispatches \
-            -d '{"event_type": "${{ github.ref }}"}'
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
deleted file mode 100644
index 284e336a29..0000000000
--- a/.github/workflows/release.yml
+++ /dev/null
@@ -1,107 +0,0 @@
-name: Publish Ruby packages
-
-on:
-  repository_dispatch:
-    types:
-      - release
-  workflow_dispatch:
-    inputs:
-      version:
-        description: 'Version of the Ruby package to release'
-        required: true
-        default: '3.3.4'
-
-jobs:
-  release:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: 3.3.4
-
-      - name: Store Ruby version
-        run: |
-          echo "RUBY_VERSION=${{ github.event.client_payload.version || github.event.inputs.version }}" >> $GITHUB_ENV
-
-      - name: Store ABI version
-        run: echo "ABI_VERSION=$(echo ${{ env.RUBY_VERSION }} | cut -d '.' -f 1-2)" >> $GITHUB_ENV
-
-      - name: Copy draft package `/tmp` to `/pub` directory
-        run: tool/release.sh ${{ env.RUBY_VERSION }}
-        env:
-          AWS_ACCESS_KEY_ID: ${{ secrets.FTP_R_L_O_AWS_ACCESS_KEY_ID }}
-          AWS_SECRET_ACCESS_KEY: ${{ secrets.FTP_R_L_O_AWS_SECRET_ACCESS_KEY }}
-          AWS_DEFAULT_REGION: us-west-2
-
-      - name: Purge URLs of release package
-        run: |
-          curl -X POST \
-            -H "Fastly-Key: ${{ secrets.FASTLY_PURGE_TOKEN }}" \
-            https://api.fastly.com/purge/cache.ruby-lang.org/pub/ruby/${{ env.ABI_VERSION }}/ruby-${{ env.RUBY_VERSION }}.tar.gz
-          curl -X POST \
-            -H "Fastly-Key: ${{ secrets.FASTLY_PURGE_TOKEN }}" \
-            https://api.fastly.com/purge/cache.ruby-lang.org/pub/ruby/${{ env.ABI_VERSION }}/ruby-${{ env.RUBY_VERSION }}.tar.xz
-          curl -X POST \
-            -H "Fastly-Key: ${{ secrets.FASTLY_PURGE_TOKEN }}" \
-            https://api.fastly.com/purge/cache.ruby-lang.org/pub/ruby/${{ env.ABI_VERSION }}/ruby-${{ env.RUBY_VERSION }}.zip
-
-      - name: Create a release on GitHub
-        run: |
-          RELEASE_TAG=$(echo v${{ env.RUBY_VERSION }} | sed 's/\./_/g')
-          echo $RELEASE_TAG
-          PREVIOUS_RELEASE_TAG=$(echo $RELEASE_TAG | awk 'BEGIN {FS="_"; OFS="_"}{ $NF=$NF-1; print }')
-          echo $PREVIOUS_RELEASE_TAG
-          tool/gen-github-release.rb $PREVIOUS_RELEASE_TAG $RELEASE_TAG --no-dry-run
-        env:
-          GITHUB_TOKEN: ${{ secrets.MATZBOT_AUTO_UPDATE_TOKEN }}
-
-      - name: Update versions index
-        run: |
-          curl -L -X POST \
-            -H "Authorization: Bearer ${{ secrets.MATZBOT_GITHUB_WORKFLOW_TOKEN }}" \
-            -H "Accept: application/vnd.github+json" \
-            -H "X-GitHub-Api-Version: 2022-11-28" \
-            https://api.github.com/repos/ruby/actions/dispatches \
-            -d '{"event_type": "update_index"}'
-
-      - name: Build and push Docker images
-        run: |
-          curl -L -X POST \
-            -H "Authorization: Bearer ${{ secrets.MATZBOT_GITHUB_WORKFLOW_TOKEN }}" \
-            -H "Accept: application/vnd.github+json" \
-            -H "X-GitHub-Api-Version: 2022-11-28" \
-            https://api.github.com/repos/ruby/docker-images/dispatches \
-            -d '{"event_type": "build", "client_payload": {"ruby_version": "${{ env.RUBY_VERSION }}"}}'
-
-      - name: Build snapcraft packages
-        run: |
-          curl -L -X POST \
-            -H "Authorization: Bearer ${{ secrets.MATZBOT_GITHUB_WORKFLOW_TOKEN }}" \
-            -H "Accept: application/vnd.github+json" \
-            -H "X-GitHub-Api-Version: 2022-11-28" \
-            https://api.github.com/repos/ruby/snap.ruby/dispatches \
-            -d '{"event_type": "build", "client_payload": {"ruby_version": "${{ env.RUBY_VERSION }}"}}'
-
-      - name: Store the latest LTS version of OpenSSL
-        run: |
-          echo "OPENSSL_VERSION=`curl -s https://api.github.com/repos/openssl/openssl/releases | jq -r '.[].tag_name | select(startswith("openssl-3.0"))' | sort -Vr | head -n1 | cut -d'-' -f2`" >> $GITHUB_ENV
-
-      - name: Update ruby-build definition
-        run: |
-          curl -L -X POST \
-            -H "Authorization: Bearer ${{ secrets.RUBY_BUILD_WORKFLOW_TOKEN }}" \
-            -H "Accept: application/vnd.github+json" \
-            -H "X-GitHub-Api-Version: 2022-11-28" \
-            https://api.github.com/repos/rbenv/ruby-build/dispatches \
-            -d '{"event_type": "update-ruby", "client_payload": {"ruby_version": "${{ env.RUBY_VERSION }}", "openssl_version": "${{ env.OPENSSL_VERSION }}"}}'
-
-      - name: Update all-ruby definition
-        run: |
-          curl -L -X POST \
-            -H "Authorization: Bearer ${{ secrets.MATZBOT_GITHUB_WORKFLOW_TOKEN }}" \
-            -H "Accept: application/vnd.github+json" \
-            -H "X-GitHub-Api-Version: 2022-11-28" \
-            https://api.github.com/repos/ruby/all-ruby/dispatches \
-            -d '{"event_type": "update"}'
diff --git a/.github/workflows/rust-warnings.yml b/.github/workflows/rust-warnings.yml
deleted file mode 100644
index b05ebbfe64..0000000000
--- a/.github/workflows/rust-warnings.yml
+++ /dev/null
@@ -1,53 +0,0 @@
-# Surface Rust warnings on PRs that touch any Rust code.
-# Not a required check so we never block people over new warnings
-# that might come from a new Rust version being released.
-name: Rust warnings
-on:
-  pull_request:
-    types:
-      - opened
-      - synchronize
-      - reopened
-    paths:
-      - '**.rs'
-      - '!**.inc.rs'
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  make:
-    env:
-      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
-
-    runs-on: ubuntu-24.04
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-
-      - name: Install Rust
-        run: rustup default beta
-
-      - name: Rust warnings
-        run: |
-          set -euo pipefail
-          cargo check --quiet --all-features --message-format=json \
-            | jq -r 'select(.reason == "compiler-message" and .message.level == "warning") | .message.rendered' \
-            > warnings.txt
-          cat warnings.txt
-          ! grep --quiet '[^[:space:]]' warnings.txt
diff --git a/.github/workflows/scorecards.yml b/.github/workflows/scorecards.yml
deleted file mode 100644
index 8cc7e00c47..0000000000
--- a/.github/workflows/scorecards.yml
+++ /dev/null
@@ -1,78 +0,0 @@
-# This workflow uses actions that are not certified by GitHub. They are provided
-# by a third-party and are governed by separate terms of service, privacy
-# policy, and support documentation.
-
-name: Scorecard supply-chain security
-on:
-  # For Branch-Protection check. Only the default branch is supported. See
-  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#branch-protection
-  branch_protection_rule:
-  # To guarantee Maintained check is occasionally updated. See
-  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#maintained
-  schedule:
-    - cron: '39 3 * * 5'
-  # push:
-  #   branches: [ "master" ]
-
-# Declare default permissions as read only.
-permissions: read-all
-
-jobs:
-  analysis:
-    name: Scorecard analysis
-    runs-on: ubuntu-latest
-    # `publish_results: true` only works when run from the default branch. conditional can be removed if disabled.
-    if: github.event.repository.default_branch == github.ref_name || github.event_name == 'pull_request'
-    permissions:
-      # Needed to upload the results to code-scanning dashboard.
-      security-events: write
-      # Needed to publish results and get a badge (see publish_results below).
-      id-token: write
-      # Uncomment the permissions below if installing in a private repository.
-      # contents: read
-      # actions: read
-
-    steps:
-      - name: "Checkout code"
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          persist-credentials: false
-
-      - name: "Run analysis"
-        uses: ossf/scorecard-action@05b42c624433fc40578a4040d5cf5e36ddca8cde # v2.4.2
-        with:
-          results_file: results.sarif
-          results_format: sarif
-          # (Optional) "write" PAT token. Uncomment the `repo_token` line below if:
-          # - you want to enable the Branch-Protection check on a *public* repository, or
-          # - you are installing Scorecard on a *private* repository
-          # To create the PAT, follow the steps in https://github.com/ossf/scorecard-action?tab=readme-ov-file#authentication-with-fine-grained-pat-optional.
-          # repo_token: ${{ secrets.SCORECARD_TOKEN }}
-
-          # Public repositories:
-          #   - Publish results to OpenSSF REST API for easy access by consumers
-          #   - Allows the repository to include the Scorecard badge.
-          #   - See https://github.com/ossf/scorecard-action#publishing-results.
-          # For private repositories:
-          #   - `publish_results` will always be set to `false`, regardless
-          #     of the value entered here.
-          publish_results: true
-
-          # (Optional) Uncomment file_mode if you have a .gitattributes with files marked export-ignore
-          # file_mode: git
-
-      # Upload the results as artifacts (optional). Commenting out will disable uploads of run results in SARIF
-      # format to the repository Actions tab.
-      - name: "Upload artifact"
-        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
-        with:
-          name: SARIF file
-          path: results.sarif
-          retention-days: 5
-
-      # Upload the results to GitHub's code scanning dashboard (optional).
-      # Commenting out will disable upload of results to your repo's Code Scanning dashboard
-      - name: "Upload to code-scanning"
-        uses: github/codeql-action/upload-sarif@v3
-        with:
-          sarif_file: results.sarif
diff --git a/.github/workflows/spec_guards.yml b/.github/workflows/spec_guards.yml
deleted file mode 100644
index 34b0202e9f..0000000000
--- a/.github/workflows/spec_guards.yml
+++ /dev/null
@@ -1,67 +0,0 @@
-name: Rubyspec Version Guards Check
-
-on:
-  push:
-    paths:
-      - '.github/workflows/spec_guards.yml'
-      - 'spec/**'
-      - '!spec/*.md'
-  pull_request:
-    paths:
-      - '.github/workflows/spec_guards.yml'
-      - 'spec/**'
-      - '!spec/*.md'
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  rubyspec:
-    name: Rubyspec
-
-    runs-on: ubuntu-22.04
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    strategy:
-      matrix:
-        # Specs from ruby/spec should still run on all supported Ruby versions.
-        # This also ensures the needed ruby_version_is guards are there, see spec/README.md.
-        ruby:
-          - ruby-3.2
-          - ruby-3.3
-          - ruby-3.4
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-
-      - uses: ruby/setup-ruby@a9bfc2ecf3dd40734a9418f89a7e9d484c32b990 # v1.248.0
-        with:
-          ruby-version: ${{ matrix.ruby }}
-          bundler: none
-
-      - run: gem install webrick
-
-      - run: ruby ../mspec/bin/mspec
-        working-directory: spec/ruby
-        env:
-          CHECK_LEAKS: true
-
-      - uses: ./.github/actions/slack
-        with:
-          label: ${{ matrix.ruby }}
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index e17d6dc3ed..af81384538 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -25,15 +25,13 @@ jobs:
     strategy:
       matrix:
         test_task: [check]
-        configure: ['']
+        configure: ['cppflags=-DRUBY_DEBUG']
         arch: ['']
         os:
+          - ubuntu-22.04
           - ubuntu-24.04
           - ubuntu-24.04-arm
-          # FIXME Comment out ppc64le due to failing tests on GitHub Actions
-          # ppc64le
-          # https://bugs.ruby-lang.org/issues/21534
-          # - ubuntu-24.04-ppc64le
+          - ubuntu-24.04-ppc64le
           - ubuntu-24.04-s390x
         # The ppc64le/s390x runners work only in the registered repositories.
         # They don't work in forked repositories.
@@ -49,6 +47,12 @@ jobs:
             configure: '--disable-yjit'
           - test_task: check
             configure: '--enable-shared --enable-load-relative'
+          - os: ubuntu-24.04-ppc64le
+            # FIXME Override the configure options with empty, due to some
+            # Ractor tests failing with the "./configure cppflags=-DRUBY_DEBUG"
+            # on ppc64le.
+            # https://bugs.ruby-lang.org/issues/21534
+            configure: ''
           - test_task: test-bundler-parallel
             timeout: 50
           - test_task: test-bundled-gems
@@ -122,9 +126,8 @@ jobs:
       - name: Run configure
         env:
           arch: ${{ matrix.arch }}
-          configure: ${{ matrix.configure }}
         run: >-
-          $SETARCH ../src/configure -C --disable-install-doc ${configure:-cppflags=-DRUBY_DEBUG}
+          $SETARCH ../src/configure -C --disable-install-doc ${{ matrix.configure }}
           ${arch:+--target=$arch-$OSTYPE --host=$arch-$OSTYPE}
 
       - run: $SETARCH make prepare-gems
diff --git a/.github/workflows/wasm.yml b/.github/workflows/wasm.yml
deleted file mode 100644
index 9294e2d339..0000000000
--- a/.github/workflows/wasm.yml
+++ /dev/null
@@ -1,181 +0,0 @@
-name: WebAssembly
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions: # added using https://github.com/step-security/secure-workflows
-  contents: read
-
-jobs:
-  make:
-    strategy:
-      matrix:
-        entry:
-#         # wasmtime can't compile non-optimized Asyncified binary due to locals explosion
-#         - { name: O0-debuginfo, optflags: '-O0', debugflags: '-g', wasmoptflags: '-O1' }
-#         - { name: O1,           optflags: '-O1', debugflags: ''  , wasmoptflags: '-O1' }
-          - { name: O2, optflags: '-O2', debugflags: '', wasmoptflags: '-O2' }
-#         - { name: O3,           optflags: '-O3', debugflags: ''  , wasmoptflags: '-O3' }
-#         # -O4 is equivalent to -O3 in clang, but it's different in wasm-opt
-#         - { name: O4,           optflags: '-O3', debugflags: ''  , wasmoptflags: '-O4' }
-#         - { name: Oz,           optflags: '-Oz', debugflags: ''  , wasmoptflags: '-Oz' }
-      fail-fast: false
-
-    env:
-      RUBY_TESTOPTS: '-q --tty=no'
-      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
-      WASI_SDK_VERSION_MAJOR: 25
-      WASI_SDK_VERSION_MINOR: 0
-      BINARYEN_VERSION: 113
-      WASMTIME_VERSION: v15.0.0
-
-    runs-on: ubuntu-22.04
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          sparse-checkout-cone-mode: false
-          sparse-checkout: /.github
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          srcdir: src
-          builddir: build
-          makeup: true
-
-      - name: Install libraries
-        run: |
-          set -ex
-          sudo apt-get update -q || :
-          sudo apt-get install --no-install-recommends -q -y ruby make autoconf git wget
-
-          wasi_sdk_deb="wasi-sdk-${WASI_SDK_VERSION_MAJOR}.${WASI_SDK_VERSION_MINOR}-x86_64-linux.deb"
-          wget "https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-${WASI_SDK_VERSION_MAJOR}/${wasi_sdk_deb}"
-          sudo dpkg -i "$wasi_sdk_deb"
-          rm -f "$wasi_sdk_deb"
-
-          mkdir build-sdk
-          pushd build-sdk
-
-          wasmtime_url="https://github.com/bytecodealliance/wasmtime/releases/download/${WASMTIME_VERSION}/wasmtime-${WASMTIME_VERSION}-x86_64-linux.tar.xz"
-          wget -O - "$wasmtime_url" | tar xJf -
-          sudo ln -fs "$PWD/wasmtime-${WASMTIME_VERSION}-x86_64-linux/wasmtime" /usr/local/bin/wasmtime
-
-          binaryen_tarball="binaryen-version_${BINARYEN_VERSION}-x86_64-linux.tar.gz"
-          binaryen_url="https://github.com/WebAssembly/binaryen/releases/download/version_${BINARYEN_VERSION}/${binaryen_tarball}"
-          wget -O - "$binaryen_url" | tar xfz -
-          sudo ln -fs "$PWD/binaryen-version_${BINARYEN_VERSION}/bin/wasm-opt" /usr/local/bin/wasm-opt
-        working-directory: src
-
-      - name: Set ENV
-        run: |
-          echo "WASI_SDK_PATH=/opt/wasi-sdk" >> $GITHUB_ENV
-
-      - uses: ruby/setup-ruby@a9bfc2ecf3dd40734a9418f89a7e9d484c32b990 # v1.248.0
-        with:
-          ruby-version: '3.1'
-          bundler: none
-
-      - name: Build baseruby
-        run: |
-          set -ex
-          mkdir ../baseruby
-          pushd ../baseruby
-          ../src/configure --prefix=$PWD/install
-          make
-          make install
-
-      - name: Download config.guess with wasi version
-        run: |
-          rm tool/config.guess tool/config.sub
-          ruby tool/downloader.rb -d tool -e gnu config.guess config.sub
-        working-directory: src
-
-      - name: Run configure
-        run: |
-          ../src/configure \
-            --host wasm32-unknown-wasi \
-            --with-baseruby=$PWD/../baseruby/install/bin/ruby \
-            --with-static-linked-ext \
-            --with-ext=cgi/escape,continuation,coverage,date,digest/bubblebabble,digest,digest/md5,digest/rmd160,digest/sha1,digest/sha2,etc,fcntl,json,json/generator,json/parser,objspace,pathname,rbconfig/sizeof,ripper,stringio,strscan,monitor \
-            LDFLAGS=" \
-              -Xlinker --stack-first \
-              -Xlinker -z -Xlinker stack-size=16777216 \
-            " \
-            optflags="${{ matrix.entry.optflags }}" \
-            debugflags="${{ matrix.entry.debugflags }}" \
-            wasmoptflags="${{ matrix.entry.wasmoptflags }} ${{ matrix.entry.debugflags }}"
-
-      # miniruby may not be built when cross-compling
-      - run: make mini ruby
-
-      - run: make install DESTDIR=$PWD/../install
-      - run: tar cfz ../install.tar.gz -C ../install .
-
-      - name: Upload artifacts
-        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
-        with:
-          name: ruby-wasm-install
-          path: ${{ github.workspace }}/install.tar.gz
-      - name: Show Playground URL to try the build
-        run: |
-          echo "Try on Playground: https://ruby.github.io/play-ruby?run=$GITHUB_RUN_ID" >> $GITHUB_STEP_SUMMARY
-
-      - name: Run basictest
-        run: wasmtime run ./../build/miniruby --mapdir /::./ -- basictest/test.rb
-        working-directory: src
-
-      - name: Run bootstraptest (no thread)
-        run: |
-          NO_THREAD_TESTS="$(grep -L Thread -R ./bootstraptest | awk -F/ '{ print $NF }' | uniq | sed -n 's/test_\(.*\).rb/\1/p' | paste -s -d, -)"
-          ruby ./bootstraptest/runner.rb --ruby="$(which wasmtime) run $PWD/../build/ruby --mapdir /::./ -- " --verbose "--sets=$NO_THREAD_TESTS"
-        working-directory: src
-
-      - uses: ./.github/actions/slack
-        with:
-          label: ${{ matrix.entry.name }}
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
-
-      # Workaround for https://github.com/orgs/community/discussions/25220
-      - name: Save Pull Request number
-        if: ${{ github.event_name == 'pull_request' }}
-        run: echo "${{ github.event.pull_request.number }}" >> ${{ github.workspace }}/github-pr-info.txt
-      - uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
-        if: ${{ github.event_name == 'pull_request' }}
-        with:
-          name: github-pr-info
-          path: ${{ github.workspace }}/github-pr-info.txt
-
-defaults:
-  run:
-    working-directory: build
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
deleted file mode 100644
index d7c88393be..0000000000
--- a/.github/workflows/windows.yml
+++ /dev/null
@@ -1,220 +0,0 @@
-name: Windows
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    # Do not use paths-ignore for required status checks
-    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  make:
-    strategy:
-      matrix:
-        include:
-          - os: 2022
-            vc: 2022
-            test_task: check
-          - os: 2025
-            vc: 2022
-            test_task: check
-          - os: 11-arm
-            test_task: 'btest test-basic test-tool' # check and test-spec are broken yet.
-            target: arm64
-          - os: 2025
-            vc: 2022
-            test_task: test-bundled-gems
-      fail-fast: false
-
-    runs-on: windows-${{ matrix.os }}
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    name: Windows ${{ matrix.os }}/Visual C++ ${{ matrix.vc }} (${{ matrix.test_task }})
-
-    env:
-      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
-      VCPKG_DEFAULT_TRIPLET: ${{ matrix.target || 'x64' }}-windows
-
-    steps:
-      - run: md build
-        working-directory:
-
-      - uses: ruby/setup-ruby@a9bfc2ecf3dd40734a9418f89a7e9d484c32b990 # v1.248.0
-        with:
-          # windows-11-arm has only 3.4.1, 3.4.2, 3.4.3, head
-          ruby-version: ${{ !endsWith(matrix.os, 'arm') && '3.1' || '3.4' }}
-          bundler: none
-          windows-toolchain: none
-
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          sparse-checkout-cone-mode: false
-          sparse-checkout: /.github
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          srcdir: src
-          builddir: build
-
-      - name: Install tools with scoop
-        run: |
-          Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser
-          iwr -useb get.scoop.sh | iex
-          Join-Path (Resolve-Path ~).Path "scoop\shims" >> $Env:GITHUB_PATH
-          scoop install vcpkg uutils-coreutils cmake@3.31.6
-        shell: pwsh
-
-      - name: Restore vcpkg artifact
-        uses: actions/cache/restore@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
-        with:
-          path: src\vcpkg_installed
-          key: windows-${{ matrix.os }}-vcpkg-${{ hashFiles('src/vcpkg.json') }}
-
-      - name: Install libraries with vcpkg
-        run: |
-          vcpkg install --vcpkg-root=%USERPROFILE%\scoop\apps\vcpkg\current
-        working-directory: src
-
-      - name: Save vcpkg artifact
-        uses: actions/cache/save@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
-        with:
-          path: src\vcpkg_installed
-          key: windows-${{ matrix.os }}-vcpkg-${{ hashFiles('src/vcpkg.json') }}
-        if: ${{ github.ref_name == 'master' || startsWith(github.ref_name, 'ruby_') }}
-
-      - name: setup env
-        # Available Ruby versions: https://github.com/actions/runner-images/blob/main/images/windows/Windows2019-Readme.md#ruby
-        # %TEMP% is inconsistent with %TMP% and test-all expects they are consistent.
-        # https://github.com/actions/virtual-environments/issues/712#issuecomment-613004302
-        run: |
-          ::- Set up VC ${{ matrix.vc }}
-          set | uutils sort > old.env
-          call ..\src\win32\vssetup.cmd ^
-            -arch=${{ matrix.target || 'amd64' }} ^
-            ${{ matrix.vcvars && '-vcvars_ver=' || '' }}${{ matrix.vcvars }}
-          nmake -f nul
-          set TMP=%USERPROFILE%\AppData\Local\Temp
-          set TEMP=%USERPROFILE%\AppData\Local\Temp
-          set MAKEFLAGS=l
-          set /a TEST_JOBS=(15 * %NUMBER_OF_PROCESSORS% / 10) > nul
-          set RUBY_OPT_DIR=%GITHUB_WORKSPACE:\=/%/src/vcpkg_installed/%VCPKG_DEFAULT_TRIPLET%
-          set | uutils sort > new.env
-          uutils comm -13 old.env new.env >> %GITHUB_ENV%
-          del *.env
-
-      - name: baseruby version
-        run: ruby -v
-
-      - name: compiler version
-        run: cl
-
-      - name: volume info
-        run: Get-Volume
-        shell: pwsh
-
-      # TODO: We should use `../src` instead of `D:/a/ruby/ruby/src`
-      - name: Configure
-        run: >-
-          ../src/win32/configure.bat --disable-install-doc
-          --with-opt-dir=%RUBY_OPT_DIR%
-          --with-gmp
-
-      - run: nmake prepare-vcpkg
-
-      - run: nmake incs
-
-      - run: nmake extract-extlibs
-
-      # On all other platforms, test-spec depending on extract-gems (in common.mk) is enough.
-      # But not for this Visual Studio workflow. So here we extract gems before building.
-      - run: nmake extract-gems
-
-      # windows-11-arm runner cannot run `ruby tool/file2lastrev.rb --revision.h --output=revision.h`
-      - name: make revision.h
-        run: |
-          if not exist revision.h (
-            for /f "tokens=1-3" %%I in ('git log -1 "--date=format-local:%%F %%T" "--format=%%H %%cd" @') do (
-              set rev=%%I
-              set dt=%%J
-              set tm=%%K
-            )
-            call set yy=%%dt:~0,4%%
-            call set /a mm=100%%dt:~5,2%% %%%% 100
-            call set /a dd=100%%dt:~8,2%% %%%% 100
-            call set branch=%%GITHUB_REF:refs/heads/=%%
-            (
-              call echo #define RUBY_REVISION "%%rev:~,10%%"
-              call echo #define RUBY_FULL_REVISION "%%rev%%"
-              call echo #define RUBY_BRANCH_NAME "%%branch%%"
-              call echo #define RUBY_RELEASE_DATETIME "%%dt%%T%%tm%%"
-              call echo #define RUBY_RELEASE_YEAR %%yy%%
-              call echo #define RUBY_RELEASE_MONTH %%mm%%
-              call echo #define RUBY_RELEASE_DAY %%dd%%
-            ) > revision.h
-            copy /y NUL .revision.time
-          )
-          type revision.h
-        env:
-          TZ: UTC
-
-      - run: nmake
-
-      - name: Set up Launchable
-        uses: ./.github/actions/launchable/setup
-        with:
-          os: windows-${{ matrix.os }}
-          launchable-token: ${{ secrets.LAUNCHABLE_TOKEN }}
-          builddir: build
-          srcdir: src
-          test-task: ${{ matrix.test_task || 'check' }}
-        continue-on-error: true
-        if: ${{ matrix.test_task != 'test-bundled-gems' }}
-        timeout-minutes: 3
-
-      - run: nmake ${{ matrix.test_task || 'check' }}
-        env:
-          RUBY_TESTOPTS: -j${{ env.TEST_JOBS || 4 }}
-        timeout-minutes: 70
-
-      - uses: ./.github/actions/slack
-        with:
-          label: Windows ${{ matrix.os }} / VC ${{ matrix.vc }} / ${{ matrix.test_task || 'check' }}
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
-
-  result:
-    if: ${{ always() }}
-    name: ${{ github.workflow }} result
-    runs-on: windows-latest
-    needs: [make]
-    steps:
-      - run: exit 1
-        working-directory:
-        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
-
-defaults:
-  run:
-    working-directory: build
-    shell: cmd
diff --git a/.github/workflows/wsl.yml b/.github/workflows/wsl.yml
deleted file mode 100644
index af490dffd7..0000000000
--- a/.github/workflows/wsl.yml
+++ /dev/null
@@ -1,72 +0,0 @@
-name: Ubuntu on WSL
-
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    # Do not use paths-ignore for required status checks
-    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
-  merge_group:
-
-jobs:
-  wsl:
-    runs-on: windows-2025
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    steps:
-      - name: Install or update WSL
-        uses: Ubuntu/WSL/.github/actions/wsl-install@main
-        with:
-          distro: Ubuntu-24.04
-
-      - name: Install dependencies
-        uses: Ubuntu/WSL/.github/actions/wsl-bash@main
-        with:
-         distro: Ubuntu-24.04
-         working-dir: /tmp/github/
-         exec: |
-            DEBIAN_FRONTEND=noninteractive sudo apt update
-            DEBIAN_FRONTEND=noninteractive sudo apt install -y ruby build-essential autoconf libssl-dev libyaml-dev zlib1g-dev libgmp-dev libffi-dev
-
-      - name: Check out the repository
-        uses: Ubuntu/WSL/.github/actions/wsl-checkout@main
-        with:
-          distro: Ubuntu-24.04
-          working-dir: /tmp/github/
-          submodules: true
-
-      - name: Build
-        uses: Ubuntu/WSL/.github/actions/wsl-bash@main
-        with:
-         distro: Ubuntu-24.04
-         working-dir: /tmp/github/
-         exec: |
-            ./autogen.sh
-            ./configure --disable-install-doc
-            make ruby -j4
-            make extract-gems
-            make -j4
-
-      - name: Test
-        uses: Ubuntu/WSL/.github/actions/wsl-bash@main
-        with:
-         distro: Ubuntu-24.04
-         working-dir: /tmp/github/
-         exec: |
-            ./ruby -v
-            # make check TESTS="-j4" MSPECOPT="-j"
diff --git a/.github/workflows/yjit-macos.yml b/.github/workflows/yjit-macos.yml
deleted file mode 100644
index 60139257af..0000000000
--- a/.github/workflows/yjit-macos.yml
+++ /dev/null
@@ -1,192 +0,0 @@
-name: YJIT macOS Arm64
-on:
-  push:
-    branches:
-      - master
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    types:
-      - opened
-      - synchronize
-      - reopened
-    # Do not use paths-ignore for required status checks
-    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  cargo:
-    name: cargo test
-
-    runs-on: macos-14
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-
-      - run: RUST_BACKTRACE=1 cargo test
-        working-directory: yjit
-
-      # Also compile and test with all features enabled
-      - run: RUST_BACKTRACE=1 cargo test --all-features
-        working-directory: yjit
-
-      # Check that we can build in release mode too
-      - run: cargo build --release
-        working-directory: yjit
-
-  make:
-    strategy:
-      matrix:
-        include:
-          - test_task: 'check'
-            configure: '--enable-yjit'
-            yjit_opts: '--yjit'
-          - test_task: 'check'
-            configure: '--enable-yjit=dev'
-            yjit_opts: '--yjit-call-threshold=1 --yjit-verify-ctx --yjit-code-gc'
-            specopts: '-T --yjit-call-threshold=1 -T --yjit-verify-ctx -T --yjit-code-gc'
-      fail-fast: false
-
-    env:
-      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
-      RUN_OPTS: ${{ matrix.yjit_opts }}
-      SPECOPTS: ${{ matrix.specopts }}
-
-    runs-on: macos-14
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          sparse-checkout-cone-mode: false
-          sparse-checkout: /.github
-
-      - name: Install libraries
-        uses: ./.github/actions/setup/macos
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          srcdir: src
-          builddir: build
-          makeup: true
-          dummy-files: ${{ matrix.test_task == 'check' }}
-          # Set fetch-depth: 10 so that Launchable can receive commits information.
-          fetch-depth: 10
-
-      - name: Run configure
-        run: ../src/configure -C --disable-install-doc ${{ matrix.configure }}
-
-      - run: make prepare-gems
-        if: ${{ matrix.test_task == 'test-bundled-gems' }}
-
-      - run: make
-
-      - name: Verify that --yjit-dump-disasm works
-        run: |
-          ./miniruby --yjit-call-threshold=1 --yjit-dump-disasm -e0 | \
-          wc -l | \
-          ruby -ne 'raise "Disassembly seems broken in dev build (output has too few lines)" unless $_.to_i > 10'
-        if: ${{ contains(matrix.configure, 'jit=dev') }}
-
-      - name: Enable YJIT through ENV
-        run: echo "RUBY_YJIT_ENABLE=1" >> $GITHUB_ENV
-
-      - name: Set test options for skipped tests
-        run: |
-          set -x
-          TESTS="$(echo "${{ matrix.skipped_tests }}" | sed 's| |$$/ -n!/|g;s|^|-n!/|;s|$|$$/|')"
-          echo "TESTS=${TESTS}" >> $GITHUB_ENV
-        if: ${{ matrix.test_task == 'check' && matrix.skipped_tests }}
-
-      - name: Set up Launchable
-        id: launchable
-        uses: ./.github/actions/launchable/setup
-        with:
-          os: macos-14
-          test-opts: ${{ matrix.configure }}
-          launchable-token: ${{ secrets.LAUNCHABLE_TOKEN }}
-          builddir: build
-          srcdir: src
-          is-yjit: true
-        continue-on-error: true
-        timeout-minutes: 3
-
-      - name: make ${{ matrix.test_task }}
-        run: |
-          test -n "${LAUNCHABLE_STDOUT}" && exec 1> >(tee "${LAUNCHABLE_STDOUT}")
-          test -n "${LAUNCHABLE_STDERR}" && exec 2> >(tee "${LAUNCHABLE_STDERR}")
-
-          make -s ${{ matrix.test_task }} ${TESTS:+TESTS="$TESTS"} \
-            RUN_OPTS="$RUN_OPTS" \
-            SPECOPTS="$SPECOPTS"
-        timeout-minutes: 60
-        env:
-          RUBY_TESTOPTS: '-q --tty=no'
-          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ''
-          SYNTAX_SUGGEST_TIMEOUT: '5'
-          PRECHECK_BUNDLED_GEMS: 'no'
-          LAUNCHABLE_STDOUT: ${{ steps.launchable.outputs.stdout_report_path }}
-          LAUNCHABLE_STDERR: ${{ steps.launchable.outputs.stderr_report_path }}
-        continue-on-error: ${{ matrix.continue-on-test_task || false }}
-
-      - name: make skipped tests
-        run: |
-          make -s test-all TESTS="${TESTS//-n!\//-n/}"
-        env:
-          GNUMAKEFLAGS: ''
-          RUBY_TESTOPTS: '-v --tty=no'
-          PRECHECK_BUNDLED_GEMS: 'no'
-        if: ${{ matrix.test_task == 'check' && matrix.skipped_tests }}
-        continue-on-error: ${{ matrix.continue-on-skipped_tests || false }}
-
-      - uses: ./.github/actions/slack
-        with:
-          label: ${{ matrix.test_task }} ${{ matrix.configure }} ${{ matrix.yjit_opts }}
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
-
-  result:
-    if: ${{ always() }}
-    name: ${{ github.workflow }} result
-    runs-on: macos-14
-    needs: [make]
-    steps:
-      - name: ${{ github.workflow }} jobs have failed
-        run: exit 1
-        working-directory:
-        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
-
-defaults:
-  run:
-    working-directory: build
diff --git a/.github/workflows/yjit-ubuntu.yml b/.github/workflows/yjit-ubuntu.yml
deleted file mode 100644
index 7ec4de8cdc..0000000000
--- a/.github/workflows/yjit-ubuntu.yml
+++ /dev/null
@@ -1,238 +0,0 @@
-name: YJIT Ubuntu
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    # Do not use paths-ignore for required status checks
-    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  cargo:
-    name: cargo test
-
-    # GitHub Action's image seems to already contain a Rust 1.58.0.
-    runs-on: ubuntu-22.04
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-
-      # For now we can't run cargo test --offline because it complains about the
-      # capstone dependency, even though the dependency is optional
-      #- run: cargo test --offline
-
-      - run: RUST_BACKTRACE=1 cargo test
-        working-directory: yjit
-
-      # Also compile and test with all features enabled
-      - run: RUST_BACKTRACE=1 cargo test --all-features
-        working-directory: yjit
-
-      # Check that we can build in release mode too
-      - run: cargo build --release
-        working-directory: yjit
-
-  lint:
-    name: cargo clippy
-
-    # GitHub Action's image seems to already contain a Rust 1.58.0.
-    runs-on: ubuntu-22.04
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-
-      # Check that we don't have linting errors in release mode, too
-      - run: cargo clippy --all-targets --all-features
-        working-directory: yjit
-
-  make:
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - test_task: 'yjit-bindgen'
-            hint: 'To fix: use patch in logs'
-            configure: '--with-gcc=clang-14 --enable-yjit=dev'
-            libclang_path: '/usr/lib/llvm-14/lib/libclang.so.1'
-
-          - test_task: 'check'
-            # YJIT should be automatically built in release mode on x86-64 Linux with rustc present
-            #configure: "--enable-yjit RUSTC='rustc +1.58.0'"
-            configure: "RUSTC='rustc +1.58.0'"
-            rust_version: '1.58.0'
-
-          - test_task: 'check'
-            configure: '--enable-yjit=dev'
-
-          - test_task: 'check'
-            configure: '--enable-yjit=dev'
-            yjit_opts: '--yjit-call-threshold=1 --yjit-verify-ctx --yjit-code-gc'
-            specopts: '-T --yjit-call-threshold=1 -T --yjit-verify-ctx -T --yjit-code-gc'
-
-          - test_task: 'test-bundled-gems'
-            configure: '--enable-yjit=dev'
-
-          - test_task: 'yjit-bench'
-            configure: '--enable-yjit=dev'
-            yjit_bench_opts: '--yjit-stats'
-            continue-on-test_task: true
-
-    env:
-      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
-      RUN_OPTS: ${{ matrix.yjit_opts }}
-      YJIT_BENCH_OPTS: ${{ matrix.yjit_bench_opts }}
-      SPECOPTS: ${{ matrix.specopts }}
-      RUBY_DEBUG: ci
-      BUNDLE_JOBS: 8 # for yjit-bench
-      RUST_BACKTRACE: 1
-
-    runs-on: ubuntu-22.04
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          sparse-checkout-cone-mode: false
-          sparse-checkout: /.github
-
-      - uses: ./.github/actions/setup/ubuntu
-
-      - uses: ruby/setup-ruby@a9bfc2ecf3dd40734a9418f89a7e9d484c32b990 # v1.248.0
-        with:
-          ruby-version: '3.1'
-          bundler: none
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          srcdir: src
-          builddir: build
-          makeup: true
-          dummy-files: ${{ matrix.test_task == 'check' }}
-          # Set fetch-depth: 10 so that Launchable can receive commits information.
-          fetch-depth: 10
-
-      - name: Install Rust
-        if: ${{ matrix.rust_version }}
-        run: rustup install ${{ matrix.rust_version }} --profile minimal
-
-      - name: Run configure
-        run: ../src/configure -C --disable-install-doc --prefix=$(pwd)/install ${{ matrix.configure }}
-
-      - run: make incs
-
-      - run: make prepare-gems
-        if: ${{ matrix.test_task == 'test-bundled-gems' }}
-
-      - run: make
-
-      - name: Verify that --yjit-dump-disasm works
-        run: |
-          ./miniruby --yjit-call-threshold=1 --yjit-dump-disasm -e0 | \
-          wc -l | \
-          ruby -ne 'raise "Disassembly seems broken in dev build (output has too few lines)" unless $_.to_i > 10'
-        if: ${{ contains(matrix.configure, 'jit=dev') }}
-
-      - name: Enable YJIT through ENV
-        run: echo "RUBY_YJIT_ENABLE=1" >> $GITHUB_ENV
-
-      # Check that the binary was built with YJIT
-      - name: Check YJIT enabled
-        run: ./miniruby --yjit -v | grep "+YJIT"
-
-      - name: Set up Launchable
-        id: launchable
-        uses: ./.github/actions/launchable/setup
-        with:
-          os: ubuntu-22.04
-          test-opts: ${{ matrix.configure }}
-          launchable-token: ${{ secrets.LAUNCHABLE_TOKEN }}
-          builddir: build
-          srcdir: src
-          is-yjit: true
-        continue-on-error: true
-        timeout-minutes: 3
-
-      - name: make ${{ matrix.test_task }}
-        run: |
-          test -n "${LAUNCHABLE_STDOUT}" && exec 1> >(tee "${LAUNCHABLE_STDOUT}")
-          test -n "${LAUNCHABLE_STDERR}" && exec 2> >(tee "${LAUNCHABLE_STDERR}")
-
-          make -s ${{ matrix.test_task }} ${TESTS:+TESTS="$TESTS"} \
-            RUN_OPTS="$RUN_OPTS" MSPECOPT=--debug SPECOPTS="$SPECOPTS" \
-            YJIT_BENCH_OPTS="$YJIT_BENCH_OPTS" YJIT_BINDGEN_DIFF_OPTS="$YJIT_BINDGEN_DIFF_OPTS"
-        timeout-minutes: 90
-        env:
-          RUBY_TESTOPTS: '-q --tty=no'
-          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ''
-          PRECHECK_BUNDLED_GEMS: 'no'
-          SYNTAX_SUGGEST_TIMEOUT: '5'
-          YJIT_BINDGEN_DIFF_OPTS: '--exit-code'
-          LIBCLANG_PATH: ${{ matrix.libclang_path }}
-          LAUNCHABLE_STDOUT: ${{ steps.launchable.outputs.stdout_report_path }}
-          LAUNCHABLE_STDERR: ${{ steps.launchable.outputs.stderr_report_path }}
-        continue-on-error: ${{ matrix.continue-on-test_task || false }}
-
-      - name: Show ${{ github.event.pull_request.base.ref }} GitHub URL for yjit-bench comparison
-        run: echo "https://github.com/${BASE_REPO}/commit/${BASE_SHA}"
-        env:
-          BASE_REPO: ${{ github.event.pull_request.base.repo.full_name }}
-          BASE_SHA: ${{ github.event.pull_request.base.sha }}
-        if: ${{ matrix.test_task == 'yjit-bench' && startsWith(github.event_name, 'pull') }}
-
-      - uses: ./.github/actions/slack
-        with:
-          label: ${{ matrix.test_task }} ${{ matrix.configure }}
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
-
-  result:
-    if: ${{ always() }}
-    name: ${{ github.workflow }} result
-    runs-on: ubuntu-latest
-    needs: [make]
-    steps:
-      - run: exit 1
-        working-directory:
-        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
-
-defaults:
-  run:
-    working-directory: build
diff --git a/.github/workflows/zjit-macos.yml b/.github/workflows/zjit-macos.yml
deleted file mode 100644
index 7b5d9f6b61..0000000000
--- a/.github/workflows/zjit-macos.yml
+++ /dev/null
@@ -1,178 +0,0 @@
-name: ZJIT macOS Arm64
-on:
-  push:
-    branches:
-      - master
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    types:
-      - opened
-      - synchronize
-      - reopened
-    # Do not use paths-ignore for required status checks
-    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  make:
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - test_task: 'zjit-check'
-            configure: '--enable-yjit=dev --enable-zjit'
-            rust_version: "1.85.0"
-
-          - test_task: 'ruby' # build test for combo build
-            configure: '--enable-yjit --enable-zjit'
-
-          - test_task: 'zjit-test-all'
-            configure: '--enable-zjit=dev'
-            testopts: '--seed=11831'
-
-          - test_task: 'btest'
-            configure: '--enable-zjit=dev'
-
-    env:
-      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
-      RUN_OPTS: ${{ matrix.zjit_opts }}
-      SPECOPTS: ${{ matrix.specopts }}
-      TESTOPTS: ${{ matrix.testopts }}
-
-    runs-on: macos-14
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          sparse-checkout-cone-mode: false
-          sparse-checkout: /.github
-
-      - name: Install libraries
-        uses: ./.github/actions/setup/macos
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          srcdir: src
-          builddir: build
-          makeup: true
-          dummy-files: ${{ matrix.test_task == 'check' }}
-          # Set fetch-depth: 10 so that Launchable can receive commits information.
-          fetch-depth: 10
-
-      - name: Install Rust
-        if: ${{ matrix.rust_version }}
-        run: |
-          rustup install ${{ matrix.rust_version }} --profile minimal
-          rustup default ${{ matrix.rust_version }}
-
-      - uses: taiki-e/install-action@v2
-        with:
-          tool: nextest@0.9
-        if: ${{ matrix.test_task == 'zjit-check' }}
-
-      - name: Run configure
-        run: ../src/configure -C --disable-install-doc ${{ matrix.configure }}
-
-      - run: make prepare-gems
-        if: ${{ matrix.test_task == 'test-bundled-gems' }}
-
-      - run: make
-
-      - name: Verify that --zjit-dump-disasm works
-        run: |
-          ./miniruby --zjit-call-threshold=1 --zjit-dump-disasm -e0 | \
-          wc -l | \
-          ruby -ne 'raise "Disassembly seems broken in dev build (output has too few lines)" unless $_.to_i > 10'
-        if: ${{ contains(matrix.configure, 'jit=dev') }}
-
-      - name: btest
-        run: |
-          RUST_BACKTRACE=1 ruby --disable=gems ../src/bootstraptest/runner.rb --ruby="./miniruby -I../src/lib -I. -I.ext/common --zjit-call-threshold=1" \
-          ../src/bootstraptest/test_attr.rb \
-          ../src/bootstraptest/test_autoload.rb \
-          ../src/bootstraptest/test_block.rb \
-          ../src/bootstraptest/test_class.rb \
-          ../src/bootstraptest/test_constant_cache.rb \
-          ../src/bootstraptest/test_env.rb \
-          ../src/bootstraptest/test_eval.rb \
-          ../src/bootstraptest/test_exception.rb \
-          ../src/bootstraptest/test_fiber.rb \
-          ../src/bootstraptest/test_finalizer.rb \
-          ../src/bootstraptest/test_flip.rb \
-          ../src/bootstraptest/test_flow.rb \
-          ../src/bootstraptest/test_fork.rb \
-          ../src/bootstraptest/test_gc.rb \
-          ../src/bootstraptest/test_insns.rb \
-          ../src/bootstraptest/test_io.rb \
-          ../src/bootstraptest/test_jump.rb \
-          ../src/bootstraptest/test_literal.rb \
-          ../src/bootstraptest/test_literal_suffix.rb \
-          ../src/bootstraptest/test_load.rb \
-          ../src/bootstraptest/test_marshal.rb \
-          ../src/bootstraptest/test_massign.rb \
-          ../src/bootstraptest/test_method.rb \
-          ../src/bootstraptest/test_objectspace.rb \
-          ../src/bootstraptest/test_proc.rb \
-          ../src/bootstraptest/test_ractor.rb \
-          ../src/bootstraptest/test_string.rb \
-          ../src/bootstraptest/test_struct.rb \
-          ../src/bootstraptest/test_syntax.rb \
-          ../src/bootstraptest/test_thread.rb \
-          ../src/bootstraptest/test_yjit_30k_ifelse.rb \
-          ../src/bootstraptest/test_yjit_30k_methods.rb \
-          ../src/bootstraptest/test_yjit_rust_port.rb
-        # ../src/bootstraptest/test_yjit.rb \
-        if: ${{ matrix.test_task == 'btest' }}
-
-      - name: make ${{ matrix.test_task }}
-        run: >-
-          make -s ${{ matrix.test_task }} ${TESTS:+TESTS="$TESTS"}
-          RUN_OPTS="$RUN_OPTS"
-          SPECOPTS="$SPECOPTS"
-          TESTOPTS="$TESTOPTS"
-        timeout-minutes: 60
-        env:
-          RUBY_TESTOPTS: '-q --tty=no'
-          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ''
-          SYNTAX_SUGGEST_TIMEOUT: '5'
-          PRECHECK_BUNDLED_GEMS: 'no'
-          TESTS: ${{ matrix.tests }}
-        continue-on-error: ${{ matrix.continue-on-test_task || false }}
-        if: ${{ matrix.test_task != 'btest' }}
-
-  result:
-    if: ${{ always() }}
-    name: ${{ github.workflow }} result
-    runs-on: macos-14
-    needs: [make]
-    steps:
-      - run: exit 1
-        working-directory:
-        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
-
-defaults:
-  run:
-    working-directory: build
diff --git a/.github/workflows/zjit-ubuntu.yml b/.github/workflows/zjit-ubuntu.yml
deleted file mode 100644
index da53a52b7d..0000000000
--- a/.github/workflows/zjit-ubuntu.yml
+++ /dev/null
@@ -1,203 +0,0 @@
-name: ZJIT Ubuntu
-on:
-  push:
-    branches:
-      - master
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    types:
-      - opened
-      - synchronize
-      - reopened
-    # Do not use paths-ignore for required status checks
-    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  make:
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - test_task: 'zjit-bindgen'
-            hint: 'To fix: use patch in logs'
-            configure: '--enable-zjit=dev --with-gcc=clang-14'
-            libclang_path: '/usr/lib/llvm-14/lib/libclang.so.1'
-
-          - test_task: 'zjit-check'
-            configure: '--enable-yjit --enable-zjit=dev'
-            rust_version: '1.85.0'
-
-          - test_task: 'zjit-test-all'
-            configure: '--enable-zjit=dev'
-            testopts: '--seed=18140'
-
-          - test_task: 'btest'
-            configure: '--enable-zjit=dev'
-
-    env:
-      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
-      RUN_OPTS: ${{ matrix.zjit_opts }}
-      YJIT_BENCH_OPTS: ${{ matrix.yjit_bench_opts }}
-      SPECOPTS: ${{ matrix.specopts }}
-      TESTOPTS: ${{ matrix.testopts }}
-      RUBY_DEBUG: ci
-      BUNDLE_JOBS: 8 # for yjit-bench
-      RUST_BACKTRACE: 1
-
-    runs-on: ubuntu-22.04
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          sparse-checkout-cone-mode: false
-          sparse-checkout: /.github
-
-      - uses: ./.github/actions/setup/ubuntu
-
-      - uses: ruby/setup-ruby@a9bfc2ecf3dd40734a9418f89a7e9d484c32b990 # v1.248.0
-        with:
-          ruby-version: '3.1'
-          bundler: none
-
-      - uses: taiki-e/install-action@v2
-        with:
-          tool: nextest@0.9
-        if: ${{ matrix.test_task == 'zjit-check' }}
-
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          srcdir: src
-          builddir: build
-          makeup: true
-          dummy-files: ${{ matrix.test_task == 'check' }}
-          # Set fetch-depth: 10 so that Launchable can receive commits information.
-          fetch-depth: 10
-
-      - name: Install Rust
-        if: ${{ matrix.rust_version }}
-        run: |
-          rustup install ${{ matrix.rust_version }} --profile minimal
-          rustup default ${{ matrix.rust_version }}
-
-      - name: Install rustfmt
-        if: ${{ matrix.test_task == 'zjit-bindgen' }}
-        run: rustup component add rustfmt
-
-      - name: Run configure
-        run: ../src/configure -C --disable-install-doc --prefix=$(pwd)/install ${{ matrix.configure }}
-
-      - run: make incs
-
-      - run: make prepare-gems
-        if: ${{ matrix.test_task == 'test-bundled-gems' }}
-
-      - run: make
-
-      - name: Verify that --zjit-dump-disasm works
-        run: |
-          ./miniruby --zjit-call-threshold=1 --zjit-dump-disasm -e0 | \
-          wc -l | \
-          ruby -ne 'raise "Disassembly seems broken in dev build (output has too few lines)" unless $_.to_i > 10'
-        if: ${{ contains(matrix.configure, 'jit=dev') }}
-
-      # Check that the binary was built with ZJIT
-      - name: Check ZJIT enabled
-        run: ./miniruby --zjit -v | grep "+ZJIT"
-        if: ${{ matrix.configure != '--disable-zjit' }}
-
-      - name: btest
-        run: |
-          RUST_BACKTRACE=1 ruby --disable=gems ../src/bootstraptest/runner.rb --ruby="./miniruby -I../src/lib -I. -I.ext/common --zjit-call-threshold=1" \
-          ../src/bootstraptest/test_attr.rb \
-          ../src/bootstraptest/test_autoload.rb \
-          ../src/bootstraptest/test_block.rb \
-          ../src/bootstraptest/test_class.rb \
-          ../src/bootstraptest/test_constant_cache.rb \
-          ../src/bootstraptest/test_env.rb \
-          ../src/bootstraptest/test_env.rb \
-          ../src/bootstraptest/test_exception.rb \
-          ../src/bootstraptest/test_fiber.rb \
-          ../src/bootstraptest/test_finalizer.rb \
-          ../src/bootstraptest/test_flip.rb \
-          ../src/bootstraptest/test_flow.rb \
-          ../src/bootstraptest/test_fork.rb \
-          ../src/bootstraptest/test_gc.rb \
-          ../src/bootstraptest/test_insns.rb \
-          ../src/bootstraptest/test_io.rb \
-          ../src/bootstraptest/test_jump.rb \
-          ../src/bootstraptest/test_literal.rb \
-          ../src/bootstraptest/test_literal_suffix.rb \
-          ../src/bootstraptest/test_load.rb \
-          ../src/bootstraptest/test_marshal.rb \
-          ../src/bootstraptest/test_massign.rb \
-          ../src/bootstraptest/test_method.rb \
-          ../src/bootstraptest/test_objectspace.rb \
-          ../src/bootstraptest/test_proc.rb \
-          ../src/bootstraptest/test_ractor.rb \
-          ../src/bootstraptest/test_string.rb \
-          ../src/bootstraptest/test_struct.rb \
-          ../src/bootstraptest/test_syntax.rb \
-          ../src/bootstraptest/test_thread.rb \
-          ../src/bootstraptest/test_yjit_30k_ifelse.rb \
-          ../src/bootstraptest/test_yjit_30k_methods.rb \
-          ../src/bootstraptest/test_yjit_rust_port.rb
-        # ../src/bootstraptest/test_yjit.rb \
-        if: ${{ matrix.test_task == 'btest' }}
-
-      - name: make ${{ matrix.test_task }}
-        run: >-
-          make -s ${{ matrix.test_task }} ${TESTS:+TESTS="$TESTS"}
-          RUN_OPTS="$RUN_OPTS" MSPECOPT=--debug SPECOPTS="$SPECOPTS"
-          TESTOPTS="$TESTOPTS"
-          ZJIT_BINDGEN_DIFF_OPTS="$ZJIT_BINDGEN_DIFF_OPTS"
-        timeout-minutes: 90
-        env:
-          RUBY_TESTOPTS: '-q --tty=no'
-          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ''
-          PRECHECK_BUNDLED_GEMS: 'no'
-          SYNTAX_SUGGEST_TIMEOUT: '5'
-          ZJIT_BINDGEN_DIFF_OPTS: '--exit-code'
-          LIBCLANG_PATH: ${{ matrix.libclang_path }}
-          TESTS: ${{ matrix.tests }}
-        continue-on-error: ${{ matrix.continue-on-test_task || false }}
-        if: ${{ matrix.test_task != 'btest' }}
-
-  result:
-    if: ${{ always() }}
-    name: ${{ github.workflow }} result
-    runs-on: ubuntu-22.04
-    needs: [make]
-    steps:
-      - name: ${{ github.workflow }} jobs have failed
-        run: exit 1
-        working-directory:
-        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
-
-defaults:
-  run:
-    working-directory: build