{
  "_doc": "IMP-91 u10 — F4 layout snapshot (step07 + step08). Pins observed layout decision axes (preset / candidates / override / computation / dynamic flags) + planning geometry (heights_px / widths_px / ratios / col_ratios) + per-zone planning shape (position / min_height_px / frame_cardinality_strict / sub_zones_count / region_layout_candidates). step_status='partial' = schema-lock marker per Step 7/8 note (region-level ratio + count-based v0 marker stays a marker, never silently flipped). layout_override_applied=True ONLY for mdx 03 (project_mdx03_frame_lock 2026-05-15 user lock — axis A vertical-2 override). Source: src/phase_z2_pipeline.py step07/step08 emit; auto_layout_preset=None for mdx 05 single-preset path. drift in heights_px/ratios = content_weight_distribution shift; drift in computation = decision-path swap (regression signal axis distinct from preset).",
  "01": {
    "step7_step_status": "partial",
    "step7_pipeline_path_connected": true,
    "layout_preset": "horizontal-2",
    "auto_layout_preset": "horizontal-2",
    "layout_override_applied": false,
    "zones_count": 2,
    "unit_count": 2,
    "layout_candidates": ["horizontal-2", "vertical-2"],
    "computation": "min_height_first + content_weight_distribution",
    "dynamic_rows": true,
    "dynamic_cols": false,
    "heights_px": [299, 272],
    "widths_px": [1180],
    "ratios": [0.511, 0.465],
    "width_ratios": [1.0],
    "step8_step_status": "partial",
    "step8_pipeline_path_connected": true,
    "zone_heights_px_planned": [299, 272],
    "zone_widths_px_planned": [1180],
    "zone_col_ratios_planned": [1.0],
    "per_zone_layout_shape": [
      {"position": "top", "min_height_px": 350, "frame_cardinality_strict": 2, "sub_zones_count": 3, "region_layout_candidates": ["region-single"]},
      {"position": "bottom", "min_height_px": 320, "frame_cardinality_strict": 3, "sub_zones_count": 3, "region_layout_candidates": ["region-single"]}
    ]
  },
  "02": {
    "step7_step_status": "partial",
    "step7_pipeline_path_connected": true,
    "layout_preset": "horizontal-2",
    "auto_layout_preset": "horizontal-2",
    "layout_override_applied": false,
    "zones_count": 2,
    "unit_count": 2,
    "layout_candidates": ["horizontal-2", "vertical-2"],
    "computation": "min_height_first + content_weight_distribution",
    "dynamic_rows": true,
    "dynamic_cols": false,
    "heights_px": [273, 298],
    "widths_px": [1180],
    "ratios": [0.467, 0.509],
    "width_ratios": [1.0],
    "step8_step_status": "partial",
    "step8_pipeline_path_connected": true,
    "zone_heights_px_planned": [273, 298],
    "zone_widths_px_planned": [1180],
    "zone_col_ratios_planned": [1.0],
    "per_zone_layout_shape": [
      {"position": "top", "min_height_px": 320, "frame_cardinality_strict": 3, "sub_zones_count": 4, "region_layout_candidates": ["region-single"]},
      {"position": "bottom", "min_height_px": 350, "frame_cardinality_strict": 3, "sub_zones_count": 3, "region_layout_candidates": ["region-single"]}
    ]
  },
  "03": {
    "step7_step_status": "partial",
    "step7_pipeline_path_connected": true,
    "layout_preset": "vertical-2",
    "auto_layout_preset": "horizontal-2",
    "layout_override_applied": true,
    "zones_count": 2,
    "unit_count": 2,
    "layout_candidates": ["horizontal-2", "vertical-2"],
    "computation": "user_override_geometry",
    "dynamic_rows": false,
    "dynamic_cols": true,
    "heights_px": [585],
    "widths_px": [408, 758],
    "ratios": [1.0],
    "width_ratios": [0.35, 0.65],
    "step8_step_status": "partial",
    "step8_pipeline_path_connected": true,
    "zone_heights_px_planned": [585],
    "zone_widths_px_planned": [408, 758],
    "zone_col_ratios_planned": [0.35, 0.65],
    "per_zone_layout_shape": [
      {"position": "left", "min_height_px": 230, "frame_cardinality_strict": 3, "sub_zones_count": 3, "region_layout_candidates": ["region-single"]},
      {"position": "right", "min_height_px": 345, "frame_cardinality_strict": 2, "sub_zones_count": 2, "region_layout_candidates": ["region-single"]}
    ]
  },
  "04": {
    "step7_step_status": "partial",
    "step7_pipeline_path_connected": true,
    "layout_preset": "top-1-bottom-2",
    "auto_layout_preset": "top-1-bottom-2",
    "layout_override_applied": false,
    "zones_count": 3,
    "unit_count": 3,
    "layout_candidates": ["top-1-bottom-2", "top-2-bottom-1", "left-1-right-2", "left-2-right-1"],
    "computation": "2d_dynamic_aggregated",
    "dynamic_rows": true,
    "dynamic_cols": true,
    "heights_px": [221, 350],
    "widths_px": [583, 583],
    "ratios": [0.378, 0.598],
    "width_ratios": [0.494, 0.494],
    "step8_step_status": "partial",
    "step8_pipeline_path_connected": true,
    "zone_heights_px_planned": [221, 350],
    "zone_widths_px_planned": [583, 583],
    "zone_col_ratios_planned": [0.494, 0.494],
    "per_zone_layout_shape": [
      {"position": "top", "min_height_px": null, "frame_cardinality_strict": null, "sub_zones_count": 4, "region_layout_candidates": ["region-single"]},
      {"position": "bottom-left", "min_height_px": 350, "frame_cardinality_strict": 4, "sub_zones_count": 5, "region_layout_candidates": ["region-single"]},
      {"position": "bottom-right", "min_height_px": 350, "frame_cardinality_strict": null, "sub_zones_count": 1, "region_layout_candidates": ["region-single"]}
    ]
  },
  "05": {
    "step7_step_status": "partial",
    "step7_pipeline_path_connected": true,
    "layout_preset": "single",
    "auto_layout_preset": null,
    "layout_override_applied": false,
    "zones_count": 1,
    "unit_count": 1,
    "layout_candidates": ["single"],
    "computation": "fr_default_from_preset",
    "dynamic_rows": false,
    "dynamic_cols": false,
    "heights_px": [585],
    "widths_px": [1180],
    "ratios": [1.0],
    "width_ratios": [1.0],
    "step8_step_status": "partial",
    "step8_pipeline_path_connected": true,
    "zone_heights_px_planned": [585],
    "zone_widths_px_planned": [1180],
    "zone_col_ratios_planned": [1.0],
    "per_zone_layout_shape": [
      {"position": "primary", "min_height_px": null, "frame_cardinality_strict": null, "sub_zones_count": 0, "region_layout_candidates": ["region-single"]}
    ]
  }
}