# IMP-17 — AI repair fallback infrastructure (carve-out)

**Status**: carve-out, **design-only**. Normal-path AI calls = 0. No runtime fallback code lands until the activation gate clears.

**Source anchors**
- IMP-17 backlog row — [`PHASE-Z-IMPLEMENTATION-ISSUE-BACKLOG.md`](PHASE-Z-IMPLEMENTATION-ISSUE-BACKLOG.md):68 (carve-out — normal path 밖, soft link IMP-04 + IMP-05).
- INSIGHT-MAP §3 — [`PHASE-Q-INSIGHT-TO-22STEP-MAP.md`](PHASE-Q-INSIGHT-TO-22STEP-MAP.md) (G3 AI repair fallback infra registry row, normal path = no).
- 22-step pipeline — [`PHASE-Z-PIPELINE-OVERVIEW.md`](PHASE-Z-PIPELINE-OVERVIEW.md) Step 12 (lines 280-287), Step 16 (lines 318-325), Step 17 (lines 326-333).
- Pattern shape reference (Phase Q Archive — link-only, do not port) — `src/content_editor.py:21,318` (httpx + retry shape, imports `sse_utils`) + `src/sse_utils.py:16-50` (SSE token parser).
- Route hint emission site — `src/phase_z2_pipeline.py:564` (`restructure` → `ai_adaptation_required` route hint; deterministic emission today, AI consumer deferred to IMP-17).

## Carve-out boundary

### Allowed (fallback path only)
- **Step 12**: when V4 emits `restructure` (route hint `ai_adaptation_required`) AND deterministic mapping cannot satisfy the frame contract, an AI proposal MAY be invoked to map `content_object` → `Internal Region` / `Frame Slot`. Output = placement proposal at content-object granularity. Frame selection, layout selection, zone topology remain deterministic.
- **Step 16 / 17**: when retry router exhausts deterministic actions (zone_ratio_retry / layout_adjust / frame_reselect / details_popup_escalation / image_fit_candidate / frame_internal_fit_candidate) AND user-approved fallback budget remains, an AI proposal MAY be invoked. Output scope identical to Step 12 — content-object placement only.

### Forbidden (any path)
- Normal-path AI calls (Step 12 deterministic mapper, all other steps).
- MDX 원문 요약·삭제·재작성 (Phase Z spacing direction guardrail: never compress text).
- HTML / CSS 직접 생성, frame contract 신설, layout / zone topology 결정 (Layer-A / Layer-B planning은 코드 영역).
- 공통 padding / spacing / tolerance 축소 (PZ-4 — no silent shrink).
- 신규 IMP ID 발급 (이 carve-out 은 IMP-17 슬롯에 영구 귀속).

## Activation gate (3-condition AND — all three required)

1. **User GO** — 명시적 axis activation 요청. carve-out 자체로는 코드 작성 트리거 안 됨.
2. **B4 frame_selection evidence integration complete** — Step 9 frame_selection 의 evidence trace 가 안정화되어야 fallback proposal 이 어떤 frame contract 안에서 동작해야 하는지 식별 가능.
3. **IMP-04 (catalog 확장) + IMP-05 (V4 fallback) live** — 카탈로그가 32 frame 으로 확장되고 V4 rank-2/3 fallback 이 활성화돼야 `ai_adaptation_required` 라우트가 실제 의미를 가짐 (현재는 dead-end route hint).

세 조건 중 하나라도 미충족이면 본 carve-out 은 design-only 상태로 잠겨 있다.

## Pattern shape reference (link-only, do not import)

Phase Q `content_editor.py` 는 **Archive Candidate** ([`PHASE-Q-AUDIT.md`](PHASE-Q-AUDIT.md):660-673) — 포팅 대상 아님. 모양만 참조한다:
- httpx async streaming + retry 구조 — `src/content_editor.py:21,318` 라인 부근 (import + `stream_sse_tokens` 호출 site).
- SSE token 파서 분리 모듈 — `src/sse_utils.py:16-50` (`stream_sse_tokens` 본체).
- `EDITOR_PROMPT` (Kei persona) 및 Kei-API endpoint 는 **영구 단절**. 재사용 금지.

## AI 격리 + Kei persona 단절 contract

- AI 호출은 normal path 에 없다 (Phase Z 원칙, [memory `feedback_ai_isolation_contract`](../../README.md)).
- 출력 단위는 항상 content_object / Internal Region / Frame Slot 또는 restructuring proposal — HTML 구조 / 레이아웃 / 프리셋 결정 X.
- Phase Q 자산 (Kei persona prompts, Kei-API endpoint, persona retry semantics) 과 단절. Phase Z 의 fallback runtime 은 별도 prompt / endpoint 설계로 출발한다 (본 carve-out 활성 시).