ci: add release automation and version check workflows

- release.yaml: auto-creates Gitea releases on semver tag push with
  changelog, version/tag consistency check, and endpoint drift check
- version-check.yaml: warns on PRs that change src/ without bumping
  the package.json version

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/version-check.yaml

@@ -0,0 +1,38 @@
+name: Version Check
+
+on:
+  pull_request:
+    branches: [main]
+    paths:
+      - 'package.json'
+      - 'src/**'
+
+jobs:
+  check-version:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Check version was bumped if source changed
+        run: |
+          BASE_SHA="${{ github.event.pull_request.base.sha }}"
+          HEAD_SHA="${{ github.event.pull_request.head.sha }}"
+
+          # Check if any src/ files changed
+          SRC_CHANGED=$(git diff --name-only "$BASE_SHA" "$HEAD_SHA" -- 'src/' | wc -l)
+          if [ "$SRC_CHANGED" -eq 0 ]; then
+            echo "No source changes detected, skipping version check."
+            exit 0
+          fi
+
+          # Compare package.json versions
+          BASE_VERSION=$(git show "${BASE_SHA}:package.json" | node -p "JSON.parse(require('fs').readFileSync('/dev/stdin','utf8')).version")
+          HEAD_VERSION=$(node -p "require('./package.json').version")
+
+          if [ "$BASE_VERSION" = "$HEAD_VERSION" ]; then
+            echo "::warning::Source files changed but package.json version was not bumped (${HEAD_VERSION}). Consider updating the version."
+          else
+            echo "Version bumped: ${BASE_VERSION} → ${HEAD_VERSION}"
+          fi