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>

tests/test_phase_z2_cli_overrides.py

@@ -57,6 +57,8 @@ def _exec_main_block(
         override_section_assignments=None,
         override_image_overrides=None,
         override_slide_css=None,
+        override_text_overrides=None,
+        override_structure_overrides=None,
         reuse_from=None,
     ):
         captured["mdx_path"] = mdx_path
@@ -67,6 +69,8 @@ def _exec_main_block(
         captured["override_section_assignments"] = override_section_assignments
         captured["override_image_overrides"] = override_image_overrides
         captured["override_slide_css"] = override_slide_css
+        captured["override_text_overrides"] = override_text_overrides
+        captured["override_structure_overrides"] = override_structure_overrides
         captured["reuse_from"] = reuse_from
 
     monkeypatch.setattr(_pz2, "run_phase_z2_mvp1", _fake_run)
@@ -329,7 +333,7 @@ def test_image_override_non_numeric_value_exits(
 
 
 def test_image_override_does_not_leak_into_sibling_axes(tmp_path, monkeypatch):
-    """A populated image override must not perturb the other four axes."""
+    """A populated image override must not perturb sibling override axes."""
     _redirect_overrides_root(tmp_path, monkeypatch)
     captured: dict[str, Any] = {}
     _exec_main_block(
@@ -350,6 +354,8 @@ def test_image_override_does_not_leak_into_sibling_axes(tmp_path, monkeypatch):
     assert captured["override_frames"] is None
     assert captured["override_zone_geometries"] is None
     assert captured["override_section_assignments"] is None
+    assert captured["override_text_overrides"] is None
+    assert captured["override_structure_overrides"] is None
 
 
 # -- IMP-45 (#74) u5 — slide-level CSS override CLI surface ----------------