feat(claude-code-plugin): move the Claude Code plugin to its own integration and ship it as 0.3.0 (#7106)

.github/workflows/claude-code-plugin-checks.yml

@@ -0,0 +1,46 @@
+name: Claude Code Plugin Checks
+
+# On PRs this is invoked by ci-gate.yml (the single required check);
+# push-to-main and manual runs remain standalone.
+on:
+  workflow_dispatch:
+  push:
+    branches: [main]
+    paths:
+      - 'integrations/claude-code-plugin/**'
+      - '.github/workflows/claude-code-plugin-checks.yml'
+  workflow_call:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.10", "3.11", "3.12"]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install test tooling
+        run: pip install pytest ruff
+        # The plugin itself has zero runtime dependencies — nothing else to install.
+
+      - name: Check manifests are valid JSON
+        working-directory: integrations/claude-code-plugin
+        run: |
+          for f in .claude-plugin/plugin.json .mcp.json hooks/hooks.json; do
+            jq empty "$f" || (echo "Invalid JSON: $f" && exit 1)
+          done
+
+      - name: Lint
+        working-directory: integrations/claude-code-plugin
+        run: python3 -m ruff check .
+
+      - name: Run tests
+        working-directory: integrations/claude-code-plugin
+        run: python3 -m pytest tests -q