ci: add PR title conventional commit check

.github/workflows/pr-title-check.yml

@@ -0,0 +1,28 @@
+name: PR Title Check
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize, reopened]
+
+jobs:
+  check-title:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check PR title follows conventional commits
+        env:
+          PR_TITLE: ${{ github.event.pull_request.title }}
+        run: |
+          PATTERN='^(feat|fix|docs|style|refactor|perf|test|build|ci|chore|revert)(\(.+\))?(!)?: .{1,}'
+          if [[ ! "$PR_TITLE" =~ $PATTERN ]]; then
+            echo "::error::PR title does not follow conventional commits format."
+            echo ""
+            echo "Expected: <type>(<scope>): <description>"
+            echo "Types: feat, fix, docs, style, refactor, perf, test, build, ci, chore, revert"
+            echo ""
+            echo "Examples:"
+            echo "  feat: add new routing recipe"
+            echo "  fix(implement): correct config-plumbing verify step"
+            echo "  docs: update README with install instructions"
+            exit 1
+          fi
+          echo "PR title is valid: $PR_TITLE"