chore: remove temporary CodeRabbit scope config

The .coderabbit.yaml added to PR #1446 was a temporary review-scoping
config (excludes tests/docs/locales to fit CodeRabbit's file cap). It was
meant to be dropped before merge but leaked onto main when #1446 merged.

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

.coderabbit.yaml

@@ -1,14 +0,0 @@
-# TEMPORARY — remove this file before merging PR #1446.
-# Excludes generated/non-source noise (tests, changesets, docs, locales) so the
-# PR fits under CodeRabbit's 150-changed-file cap and the review focuses on
-# source logic. Intentionally NOT kept on main — drop before merge.
-reviews:
-  path_filters:
-    - "!**/__tests__/**"
-    - "!**/*.test.ts"
-    - "!**/*.test.tsx"
-    - "!.changeset/**"
-    - "!docs/**"
-    - "!**/*.md"
-    - "!**/locales/**"
-    - "!**/*.snap"