Check — Change Verification + Rule Evolution

Analyze git diff against .hoyeon/rules/ to catch missed cascading changes, then propose rule updates when new unmatched patterns are detected.

Prerequisite: The project must have a .hoyeon/rules/ directory containing rule files with YAML frontmatter. If .hoyeon/rules/ does not exist, guide the user to create it: mkdir -p .hoyeon/rules, then help them write their first rule file following ${baseDir}/references/rules-authoring.md.

Two-phase structure:

• Phase 1 (always): Validate changes — produce PASS/WARN results
• Phase 2 (conditional): Propose rule updates — only when unmatched patterns exist

Phase 1: Change Validation

1. Collect Changed Files