v0.5.1 — fix coderabbit-loop infinite loop + enforce green light rule
Changes
- coderabbit-loop.ts: add processed comment cache (prevents re-applying fixes), fallback green light detection
- AGENTS.md: add CodeRabbit Green Light Rule — no merge without exit 0
- skills/git-merge/SKILL.md: add Guard Clause 2 — verify green light before merge