docs(phase256): document P1.13.5 boundary SSOT unification
Phase 256.8.5 Cleanup: Document the completion of boundary SSOT
unification across Pattern4/6/7.
Updates:
- Phase 256 README: Add P1.13.5 section with implementation details
- 10-Now.md: Add P1.13.5 to recent fixes list
Documentation highlights:
- Background: Pattern2 fix needed horizontal expansion
- Implementation: SSOT unified across all patterns (2,3,4,6,7)
- Benefits: Structural prevention of entry param mismatch
- Results: ~40 lines of duplication eliminated, magic numbers removed
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
tomoaki
8394b2d6fd