Remove tracked PR review gate; run review checks locally

The review gate does not belong committed inside a published repo. Review checks run
locally via the global git hooks and the maintainer's tooling; the script is gitignored
so it stays out of the tree.

Author: yingchen-coding

.gitignore

@@ -15,3 +15,4 @@ htmlcov/
 .loopforge-run/
 tmp-loopforge-*/
 LAUNCH-KIT.private.md
+scripts/pr_review_check.sh