ci: enforce conventional commits on PR titles

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: richardthe3rd

.github/workflows/ci.yml

@@ -18,6 +18,14 @@ concurrency:
   cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
 
 jobs:
+  lint-pr:
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: amannn/action-semantic-pull-request@v5
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
   # Detect which files have changed
   changes:
     runs-on: ubuntu-latest