Address PR Comments

Use GitHub review metadata plus the local checkout.

Workflow:

1. Fetch PR metadata and review comments.
2. Separate actionable comments from noise or already-resolved remarks.
3. Inspect the touched code paths locally.
4. Implement the agreed fixes.
5. Run the smallest relevant validation.
6. Summarize what was addressed and any comments left intentionally unresolved.

Follow repo conventions from AGENTS.md: no AI attribution, signed commits when committing.