Skip lint on main pushes, keep it on PRs

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: dfalling

.github/workflows/ci.yml

@@ -26,6 +26,7 @@ jobs:
         run: bunx tsc --noEmit
 
       - name: Biome (lint + format check)
+        if: github.event_name == 'pull_request'
         run: bun run lint
 
       - name: Test