fix: make overlap check informational only (always green)

- Add continue-on-error: true to workflow
- Remove sys.exit(1) on conflicts
- Check is meant to inform contributors, not block merging

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

@@ -33,5 +33,7 @@ jobs:
       - name: Run overlap detection
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        # Always succeed - this check informs contributors, it shouldn't block merging
+        continue-on-error: true
         run: |
           python .github/scripts/detect_overlaps.py ${{ github.event.pull_request.number }}