feat!: remove the sync-github-labels composite action (superseded by declarative IssueLabels)

.github/workflows/ci.yaml

@@ -958,24 +958,6 @@ jobs:
 
           rm -rf "$okbin" "$badver" "$noskill" "$win" "$badarch" "$oldskill" "$nounzip"
 
-  # ── sync-github-labels ─────────────────────────────────────
-  test-sync-github-labels:
-    if: "${{ !startsWith(github.head_ref, 'release-please--') && !startsWith(github.event.head_commit.message, 'chore(main): release ') }}"
-    runs-on: ubuntu-latest
-    permissions:
-      issues: write
-    steps:
-      - name: 📑 Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
-
-      - name: 🧪 Run sync-github-labels
-        uses: ./sync-github-labels
-        with:
-          config-file: .github/labels.yaml
-          delete-other-labels: "false"
-
   # ── update-agent-skills ───────────────────────────────────
   test-update-agent-skills-noop:
     if: "${{ !startsWith(github.head_ref, 'release-please--') && !startsWith(github.event.head_commit.message, 'chore(main): release ') }}"
@@ -1172,36 +1154,6 @@ jobs:
           close-comment: "🧪 Closed by test workflow."
           github-token: ${{ secrets.GITHUB_TOKEN }}
 
-  # ── sync-github-labels (negative path) ─────────────────────
-  test-sync-github-labels-missing-config:
-    if: "${{ !startsWith(github.head_ref, 'release-please--') && !startsWith(github.event.head_commit.message, 'chore(main): release ') }}"
-    runs-on: ubuntu-latest
-    permissions:
-      issues: write
-    steps:
-      - name: 📑 Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
-
-      - name: 🧪 Run sync-github-labels with a missing config file (expected to fail)
-        id: sync
-        continue-on-error: true
-        uses: ./sync-github-labels
-        with:
-          config-file: .github/this-config-does-not-exist.yaml
-          delete-other-labels: "false"
-
-      - name: ✅ Verify step failed as expected
-        shell: bash
-        env:
-          OUTCOME: ${{ steps.sync.outcome }}
-        run: |
-          if [[ "$OUTCOME" != "failure" ]]; then
-            echo "::error::Expected the action to fail on a missing config file, got: $OUTCOME"
-            exit 1
-          fi
-
   # ── login-to-ghcr (negative path) ──────────────────────────
   test-login-to-ghcr-empty-token:
     if: "${{ !startsWith(github.head_ref, 'release-please--') && !startsWith(github.event.head_commit.message, 'chore(main): release ') }}"
@@ -2260,14 +2212,12 @@ jobs:
       - test-setup-ksail-cli
       - test-retry-script
       - test-ensure-gh-skill-script
-      - test-sync-github-labels
       - test-update-agent-skills-noop
       - test-update-agent-skills-dry-run
       - test-update-agent-skills-missing-dir
       - test-upload-coverage
       - test-upsert-issue-create
       - test-upsert-issue-close
-      - test-sync-github-labels-missing-config
       - test-login-to-ghcr-empty-token
       - test-setup-go-toolchain-invalid-version
       - test-upsert-issue-missing-body
@@ -2339,14 +2289,12 @@ jobs:
             ${{ needs.test-setup-ksail-cli.result }}
             ${{ needs.test-retry-script.result }}
             ${{ needs.test-ensure-gh-skill-script.result }}
-            ${{ needs.test-sync-github-labels.result }}
             ${{ needs.test-update-agent-skills-noop.result }}
             ${{ needs.test-update-agent-skills-dry-run.result }}
             ${{ needs.test-update-agent-skills-missing-dir.result }}
             ${{ needs.test-upload-coverage.result }}
             ${{ needs.test-upsert-issue-create.result }}
             ${{ needs.test-upsert-issue-close.result }}
-            ${{ needs.test-sync-github-labels-missing-config.result }}
             ${{ needs.test-login-to-ghcr-empty-token.result }}
             ${{ needs.test-setup-go-toolchain-invalid-version.result }}
             ${{ needs.test-upsert-issue-missing-body.result }}

AGENTS.md

@@ -16,7 +16,6 @@ This file is the single canonical instructions file for the repository. It is re
 │   │                             #   repo-owned = `ci.yaml` + `active-*.yaml`;  reusable products = every other name.
 │   ├── ci.yaml                   # repo-owned: one `test-<action>` job per action + one `[Test]` job per reusable workflow
 │   ├── active-release.yaml       # repo-owned: release-please driver (release PR → tag)
-│   ├── active-sync-github-labels.yaml  # repo-owned: label-sync caller
 │   ├── create-release.yaml       # reusable product (workflow_call): semantic-release automation for consumer repos
 │   └── <name>.yaml               # the other reusable `workflow_call` products (dependency-review, validate-go-project, …)
 ├── fixtures/                     # fixtures for the action `test-<action>` jobs

README.md

@@ -38,7 +38,6 @@ flowchart TD
 | [setup-agent-skills](setup-agent-skills/README.md) | Install agent skills via `gh skill` from a newline list of `<owner/repo> <skill>[@pin]` entries, for one or more agents (e.g. Copilot, Claude Code) |
 | [setup-go-toolchain](setup-go-toolchain/README.md) | Setup Go with optional private module support |
 | [setup-ksail-cli](setup-ksail-cli/README.md) | Install KSail CLI via Homebrew |
-| [sync-github-labels](sync-github-labels/README.md) | Sync GitHub labels from a configuration file |
 | [update-agent-skills](update-agent-skills/README.md) | Run `gh skill update --all` against installed skills and report changes |
 | [upload-coverage](upload-coverage/README.md) | Upload a Cobertura coverage report to GitHub Code Quality |
 | [upsert-issue](upsert-issue/README.md) | Create, update, reopen, or close a GitHub issue by title |