wip: phase_z2 evidence 파이프라인 + matching 실험(phase2~26) + 프론트 trace 패널 진행분 스냅샷

- src: phase_z2 composition/mapper/pipeline/placement_planner/retry, ai_fallback(prompts/schema/validate), mdx_text_atoms 신규
- Front: PipelineTracePanel 신규, FramePanel/SlideCanvas/Home/designAgentApi 등 갱신 + 테스트 4종 추가
- templates/phase_z2: catalog(component_expansion_registry, node_slot_mapping 신규), frames, families, slide_base 갱신
- tests/matching: phase2~26 매칭 실험 스크립트·리포트·온톨로지 전체 (미커밋 진행분)
- tests: b4_v4 evidence, task5~28.5 시리즈, regression(imp95 baseline) 등 신규 테스트 대량 추가
- docs/reference: MDX 구조 인벤토리, MDX→Frame 구조 계약 문서
- scripts: mdx 계약/parity/coverage/viewport 체크, gitea comment, run sync 유틸
- .gitignore: tmp*.json, chromedriver, .orchestrator, *.pkl, Front_test* 등 임시/스냅샷 제외

미완성 작업의 보존용 스냅샷 커밋 (2026-07-02)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/phase_z2_ai_fallback/schema.py

@@ -4,6 +4,7 @@ Whitelisted proposal kinds (Stage 2 plan):
   - builder_options_patch     : zone/frame builder option overrides
   - partial_overrides         : Internal Region / Frame Slot content overrides
   - slot_mapping_proposal     : restructuring proposal (content unit mapping)
+  - design_adaptation_plan    : structure-only plan; code applies verbatim MDX
 
 Forbidden output forms (rejected by validator):
   - mdx_text          (MDX read-only — `feedback_ai_isolation_contract`)
@@ -23,6 +24,7 @@ class ProposalKind(str, Enum):
     BUILDER_OPTIONS_PATCH = "builder_options_patch"
     PARTIAL_OVERRIDES = "partial_overrides"
     SLOT_MAPPING_PROPOSAL = "slot_mapping_proposal"
+    DESIGN_ADAPTATION_PLAN = "design_adaptation_plan"
 
 
 FORBIDDEN_KINDS: frozenset[str] = frozenset(