chore: disable CodeRabbit review status comments

Suppress the automatic "Review skipped" comments on PRs.
CodeRabbit can still be invoked on-demand with @coderabbitai review.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.coderabbit.yaml

@@ -6,7 +6,7 @@ reviews:
   profile: chill
   high_level_summary: true
   request_changes_workflow: false
-  review_status: true
+  review_status: false
   collapse_walkthrough: false
   poem: false
   auto_review: