test: verify CodeRabbit merge gate on main

Throwaway change to confirm branch protection lets a PR merge on a
green CodeRabbit check + resolved conversations without a human approval.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: ankur-arch

CODERABBIT-GATE-TEST.md

@@ -0,0 +1,7 @@
+# CodeRabbit gate test
+
+Throwaway PR to verify the new merge policy on `main`:
+merges are gated by the required `CodeRabbit` status check plus
+conversation resolution, with no human approval required.
+
+This file will be deleted once the test is complete.