phase z catalog: Step 7-A (layouts) + 8-A (regions/display) 박힘

사용자 lock 2026-05-07 — catalog data 는 yaml/HTML 에서 사람이 보고 modify
가능 (= hardcoded dict 위배 제거).

추가:
- templates/phase_z2/layouts/layouts.yaml — 8 preset (single / horizontal-2 /
  vertical-2 / top-1-bottom-2 / top-2-bottom-1 / left-1-right-2 / left-2-right-1
  / grid-2x2). 기존 hardcoded LAYOUT_PRESETS dict (src/phase_z2_composition.py)
  → catalog 이전. backward compat (load_layout_presets() 가 같은 dict shape).
  필드: zones / topology / positions / css_areas / css_cols / css_rows /
  render_ready / default_selection / candidate_when. (Step 7-A)
- templates/phase_z2/layouts/layouts_preview.html — 8 preset 시각 검증.

- templates/phase_z2/regions/region_layouts.yaml — Internal Region 6 entry
  (region-single / vertical-stack / horizontal-split / main-support /
  preview-details / grid-2x2). SPEC §2.5 의 sequential first-match
  decision tree. region-vertical-stack only default_fallback. (Step 8-A)
- templates/phase_z2/regions/display_strategies.yaml — display 4 entry
  (inline_full / inline_preview_with_details / details_only / dropped).
  applies_to / forbidden_for / detail_trigger.placement: top-right.
  사용자 절대 lock: text/table/image/details 절대 dropped X (forbidden_for).
- templates/phase_z2/regions/regions_preview.html — 6 region + 4 display 카드
  시각 검증 (axis 분리 lock — region structure ≠ display policy).

axis 분리 lock (사용자 2026-05-07):
- region (structure axis) ≠ display (policy axis) → 두 catalog 분리.
- preserves_original 은 display_strategies 의 single source of truth.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

templates/phase_z2/regions/region_layouts.yaml

@@ -0,0 +1,95 @@
+# Phase Z Region Layout Catalog (Internal Region structure)
+#
+# User lock (2026-05-07) — Step 8-A:
+#   Internal Region (= child zone) layout vocabulary catalog.
+#   Source: docs/architecture/PHASE-Z-CONTENT-OBJECT-SUBZONE-SPEC.md §2.5 (v1, 6 entry).
+# Code connection (2026-05-08, Step 8-conn):
+#   src/phase_z2_composition.py::load_region_layouts() reads this file.
+#   src/phase_z2_pipeline.py step08 artifact records select_region_layout_candidates() output
+#   per zone (placeholder signals: region_count=1, Step 3/4 부재 종속).
+#   Step 9 v0 (application_plan) consumes the candidate list per unit.
+#
+# Hierarchy:
+#   Slide -> Layout (slide-body zone 분배)
+#     -> Zone -> Internal Region (this catalog) -> Frame -> Frame Slot -> Content
+#
+# Decision rule (SPEC §2.5 deterministic, AI X):
+#   1. region_count == 1                                   -> region-single
+#   2. details_presence == true / large content            -> region-preview-details
+#   3. region_count == 4 AND 4 equal items                 -> region-grid-2x2
+#   4. region_count == 2 AND primary+supporting + ratio    -> region-main-support
+#   5. region_count == 2 AND visual element (image/diagram)-> region-horizontal-split
+#   6. fallback                                            -> region-vertical-stack
+#
+# Per-entry fields:
+#   region_count: int | str  (e.g. 1, 2, 4, "2+")
+#   topology: vertical | horizontal | grid | weighted | preview-details | single
+#   default_fallback: bool   (true only for region-vertical-stack — SPEC §2.5)
+#   description: str
+#   candidate_when: dict     (decision rule signals — Step 8-B input)
+
+
+region-single:
+  region_count: 1
+  topology: single
+  default_fallback: false
+  description: 1 region (zone entire = single region)
+  candidate_when:
+    region_count: 1
+
+
+region-vertical-stack:
+  region_count: "2+"
+  topology: vertical
+  default_fallback: true
+  description: Vertical top-bottom stack. Default fallback when no other rule matches.
+  candidate_when:
+    region_count_ge: 2
+    flow_type: sequential
+
+
+region-horizontal-split:
+  region_count: 2
+  topology: horizontal
+  default_fallback: false
+  description: Left-right horizontal split (text + image, text + diagram).
+  candidate_when:
+    region_count: 2
+    has_visual_element: true   # image / diagram in content_type_mix
+
+
+region-main-support:
+  region_count: 2
+  topology: weighted
+  default_fallback: false
+  description: Main region + supporting region (asymmetric ratio, e.g. 0.7 / 0.3).
+  ratios_default: [0.7, 0.3]
+  candidate_when:
+    region_count: 2
+    role_pattern: primary_supporting
+    ratio_asymmetric: true        # max / min >= 2
+
+
+region-preview-details:
+  region_count: 2
+  topology: preview-details
+  default_fallback: false
+  description: Inline preview region + details/popup region.
+  # preserves_original 은 display_strategies.yaml 의 책임 (axis 분리 lock 2026-05-07).
+  # User lock (원문 무손실 보존) 은 display_strategies 의 inline_preview_with_details
+  # / details_only 의 preserves_original: true 로 single source of truth 박힘.
+  candidate_when:
+    or:
+      - details_presence: true
+      - large_table: ">= 5 rows"
+      - long_text: true
+
+
+region-grid-2x2:
+  region_count: 4
+  topology: grid
+  default_fallback: false
+  description: 2x2 grid (4 equal regions).
+  candidate_when:
+    region_count: 4
+    flow_type: parallel_4