Pattern2(Loop with Break)を Plan/Frag SSOT へ移行。 主な変更: - Pattern2BreakPlan 追加(DomainPlan variant) - extract_pattern2_plan() 実装(PoC サブセット厳守) - normalize_pattern2_break() 実装(6-block CFG, 3 PHI) - after_bb PHI が本質: carrier_out = PHI(header: carrier_current, break_then: carrier_break) - router に Pattern2 追加(Pattern1 より前、より具体的) テスト: - Fixture B (break without update): PASS (出力 11) - quick smoke: 154/154 PASS 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>