v0.3.11

Summary

• Adds optional maker-checker proof for loop-it run --execute codex via --checker codex.
• Records checker receipts in .loop-it/progress.json, including pass, skipped, blocked, and inconclusive states.
• Expands smoke coverage for checker approval and checker-blocked stop behavior.

Verification

• npm run check
• npm run smoke:public-install
• npm publish --dry-run --access public
• Main GitHub Check run passed before release creation.