Address PR Comments

Turn a pull request's open review comments into resolved threads — each one loaded, understood, verified against the code as it exists now, and either fixed or answered with technical reasoning. Review feedback is input to evaluate, not instructions to obey: bots and humans are both sometimes wrong, and blind implementation of a wrong suggestion is worse than no response.

0. Apply receiving-code-review if available

Check the skills available in this session for one named receiving-code-review. If it exists, invoke it and let it govern how each comment is processed — it is the authority on the reception discipline.

Whether or not it is available, these invariants hold: