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/layouts/layouts.yaml

@@ -0,0 +1,130 @@
+# Phase Z 8-preset Layout Catalog
+#
+# User lock (2026-05-07) — Step 7-A:
+#   Layout definitions migrated from hardcoded dict (src/phase_z2_composition.py
+#   LAYOUT_PRESETS) to this catalog. Logic unchanged — backward compat
+#   (load_layout_presets() returns same dict shape).
+#
+# Hierarchy:
+#   slide_base (templates/phase_z2/slide_base.html)
+#     -> layout (this catalog)
+#       -> zone (positions)
+#         -> frame family partial (templates/phase_z2/families/*.html)
+#           -> slot payload
+#
+# Per-layout fields:
+#   render_ready: bool
+#     - true: layout has full grid definition + verified rendering path
+#     - false: layout defined but render path incomplete (future-proof marker)
+#   default_selection: bool
+#     - true: select_layout_preset() picks this as default for matching unit_count
+#     - false: defined alternative — not picked by current single-decision logic
+#       (consumed by Step 7-B multiple-candidate generation, Step 9 fit eval)
+#   candidate_when:
+#     unit_count + optional signals (orientation / layout topology hint)
+#     used by Step 7-B / Step 9 (currently inert — single-decision logic in
+#     select_layout_preset() ignores this field).
+#     unit_count = layout placement unit count (Step 4 output) =
+#                  raw section_count + promoted lead_orphans 등.
+
+single:
+  zones: 1
+  topology: single
+  positions: [primary]
+  css_areas: '"primary"'
+  css_cols: 1fr
+  css_rows: 1fr
+  render_ready: true
+  default_selection: true
+  candidate_when:
+    unit_count: 1
+
+horizontal-2:
+  zones: 2
+  topology: rows
+  positions: [top, bottom]
+  css_areas: '"top" "bottom"'
+  css_cols: 1fr
+  css_rows: 1fr 1fr
+  render_ready: true
+  default_selection: true
+  candidate_when:
+    unit_count: 2
+    orientation: horizontal
+
+vertical-2:
+  zones: 2
+  topology: cols
+  positions: [left, right]
+  css_areas: '"left right"'
+  css_cols: 1fr 1fr
+  css_rows: 1fr
+  render_ready: true
+  default_selection: false
+  candidate_when:
+    unit_count: 2
+    orientation: vertical
+
+top-1-bottom-2:
+  zones: 3
+  topology: T
+  positions: [top, bottom-left, bottom-right]
+  css_areas: '"top top" "bottom-left bottom-right"'
+  css_cols: 1fr 1fr
+  css_rows: 1fr 1fr
+  render_ready: true
+  default_selection: true
+  candidate_when:
+    unit_count: 3
+    layout: T
+
+top-2-bottom-1:
+  zones: 3
+  topology: inverted-T
+  positions: [top-left, top-right, bottom]
+  css_areas: '"top-left top-right" "bottom bottom"'
+  css_cols: 1fr 1fr
+  css_rows: 1fr 1fr
+  render_ready: true
+  default_selection: false
+  candidate_when:
+    unit_count: 3
+    layout: inverted-T
+
+left-1-right-2:
+  zones: 3
+  topology: side-T-left
+  positions: [left, right-top, right-bottom]
+  css_areas: '"left right-top" "left right-bottom"'
+  css_cols: 1fr 1fr
+  css_rows: 1fr 1fr
+  render_ready: true
+  default_selection: false
+  candidate_when:
+    unit_count: 3
+    layout: side-T-left
+
+left-2-right-1:
+  zones: 3
+  topology: side-T-right
+  positions: [left-top, right, left-bottom]
+  css_areas: '"left-top right" "left-bottom right"'
+  css_cols: 1fr 1fr
+  css_rows: 1fr 1fr
+  render_ready: true
+  default_selection: false
+  candidate_when:
+    unit_count: 3
+    layout: side-T-right
+
+grid-2x2:
+  zones: 4
+  topology: 2x2
+  positions: [top-left, top-right, bottom-left, bottom-right]
+  css_areas: '"top-left top-right" "bottom-left bottom-right"'
+  css_cols: 1fr 1fr
+  css_rows: 1fr 1fr
+  render_ready: true
+  default_selection: true
+  candidate_when:
+    unit_count: 4