feat: Harden execute agent prompt with industry best practices
- Add Conventional Commits format requirement to git workflow
- Add pre-commit hook guidance (never --no-verify)
- Add secrets/credentials guard (never stage .env, API keys)
- Strengthen git add reasoning (explain why not git add .)
- Add CLAUDE.md read step to session startup
- Add lint/type-check gate to verification step
- Add doc update step to execution protocol
- Expand Definition of Done: lint, types, docs, debug cleanup
- Add anti-patterns: debug artifacts, spinning on failures (3x retry cap)
- Add stale reference check on file renames/moves
- Improve error signal guidance (include stack traces, not summaries)
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