docs: add Phase Q insight to 22-step map

- Add docs/architecture/PHASE-Q-INSIGHT-TO-22STEP-MAP.md as
  implementation prereq lock (audit + frontend matching insight
  → 22-step pipeline mapping + Archive guardrail)
- Sections: §0 Purpose/Boundary (9 Archive markers) /
  §1 SoT Read Result / §2 22-step status & improvement map
  (23 rows × 7 columns, Block A/B/C subsections) /
  §3 Separate Axis Registry (9 axes) /
  §4 audit §1 Mapping Correction Candidates (5 catches) /
  §5 Cleanup Candidates (3) /
  §6 Frontend Matching Insight — Source Pending
- Register the new doc in PHASE-Z-ROADMAP.md §8 (frontend
  matching insight marked as source pending)

docs/architecture/PHASE-Z-ROADMAP.md

@@ -277,6 +277,7 @@ frontend (`design_agent_front/design-agent`) 와 backend phase_z2 의 연결 axi
 | [`PHASE-Z-CHANGE-LOG.md`](PHASE-Z-CHANGE-LOG.md) | 의사결정 변경 이력 (axis 단위, 시간 순) | 작업 단위 |
 | **`PHASE-Z-ROADMAP.md`** (본 문서) | **앞으로의 진행 순서 / 큰 axis / 우선순위** | **자주** |
 | [`PHASE-Q-AUDIT.md`](PHASE-Q-AUDIT.md) | Phase Q 모듈의 Keep / Migrate / Reference / Delete 결정 + Salvage Plan + ROADMAP §7-B 우선순위 재정렬의 input | audit 진행 중 (모듈별로 1 turn) |
+| [`PHASE-Q-INSIGHT-TO-22STEP-MAP.md`](PHASE-Q-INSIGHT-TO-22STEP-MAP.md) | audit insight + frontend matching insight(source pending) → 22-step pipeline 매핑 + implementation 전 prereq lock | implementation axis 활성 시 |
 | `PROCESS_OVERVIEW.html` | 보고 / 피드백용 시각 프로토타입 | 보고 시점 |
 
 각 문서가 자기 역할만 하면 drift / 중복 / outdated 방지.