- Create phases/phase-109/README.md - Update 10-Now.md with completion report 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Phase 109: error_tags hints SSOT
Purpose: Unify policy/validator errors with "tag + message + hint" format.
Changes: Added freeze_with_hint() API, migrated Phase 107/104/100 representative policies.
Acceptance: cargo test --lib + smoke regression PASS.