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          "fixed_elements_inventory": [
            {
              "number": 4,
              "label": "helm wheel",
              "position_hint": "starboard-forward side of the control console",
              "category": "furniture"
            },
            {
              "number": 5,
              "label": "marine control console",
              "position_hint": "across the forward wall below the window bank",
              "category": "furniture"
            }
          ],
          "standard_of_living_band": "modest_residential",
          "lighting_identity": {
            "diagnostics": [
              "lighting identity is an LLM-emit slot (W20B); W20A leaves this empty by contract."
            ]
          }
        },
        "fp_geometry_candidates": {
          "grid_size": [
            10,
            10
          ],
          "camera_cell_candidates_per_unit": {},
          "look_at_cell_candidates_per_unit": {},
          "view_cone_lens_enum_map": {
            "wide": 90,
            "normal": 50,
            "telephoto": 25
          },
          "visible_units_candidates": {},
          "visible_openings_candidates": {},
          "wall_door_invalidation_diagnostics": [],
          "diagnostics": [
            "VLM 10x10 readback is synthetic_placeholder; camera / look-at / visible-units / visible-openings cell enumerations are left empty pending a real VLM wiring wave."
          ]
        },
        "fp_geometry_vlm_readback": {
          "status": "synthetic_placeholder",
          "grid_size": [
            10,
            10
          ],
          "observed_markers": null,
          "missing_markers": null,
          "extra_markers": null,
          "confidence": null,
          "gate_decision": "synthetic_pass",
          "diagnostics": [
            "VLM readback not invoked (W20A synthetic-only path).",
            "A real VLM provider must be wired and approved separately before this slot can transition out of synthetic_placeholder."
          ]
        },
        "base_marker_inventory": [
          {
            "number": 1,
            "label": "forward control zone",
            "category": "area",
            "position_hint": "forward end of wheelhouse beneath the forward windows",
            "base_layer_decision": "base_structural_unit"
          },
          {
            "number": 2,
            "label": "central standing zone",
            "category": "area",
            "position_hint": "center of wheelhouse between the console and aft doorway",
            "base_layer_decision": "base_structural_unit"
          },
          {
            "number": 3,
            "label": "aft threshold zone",
            "category": "area",
            "position_hint": "aft edge of wheelhouse immediately inside the deck doorway",
            "base_layer_decision": "base_structural_unit"
          },
          {
            "number": 4,
            "label": "helm wheel",
            "category": "furniture",
            "position_hint": "starboard-forward side of the control console",
            "base_layer_decision": "base_persistent_fixture"
          },
          {
            "number": 5,
            "label": "marine control console",
            "category": "furniture",
            "position_hint": "across the forward wall below the window bank",
            "base_layer_decision": "base_persistent_fixture"
          },
          {
            "number": 6,
            "label": "forward window bank",
            "category": "opening",
            "position_hint": "centered across the forward wall above the control console",
            "base_layer_decision": "base_opening"
          },
          {
            "number": 7,
            "label": "port-side window",
            "category": "opening",
            "position_hint": "forward half of the port wall",
            "base_layer_decision": "base_opening"
          },
          {
            "number": 8,
            "label": "starboard-side window",
            "category": "opening",
            "position_hint": "forward half of the starboard wall beside the helm",
            "base_layer_decision": "base_opening"
          },
          {
            "number": 9,
            "label": "aft deck doorway",
            "category": "opening",
            "position_hint": "center of the aft wall, opening toward the threshold zone",
            "base_layer_decision": "base_opening"
          }
        ],
        "overlay_marker_inventory": [
          {
            "bg_id": "L21B01",
            "number": 10,
            "label": "temporary helm blockage",
            "base_layer_decision": "state_overlay_transient_object"
          },
          {
            "bg_id": "L21B02",
            "number": 12,
            "label": "subjective circular distortion",
            "base_layer_decision": "state_overlay_plot_cue"
          },
          {
            "bg_id": "L21B02",
            "number": 13,
            "label": "subjective red circle",
            "base_layer_decision": "state_overlay_plot_cue"
          },
          {
            "bg_id": "L21B03",
            "number": 11,
            "label": "old printed photograph",
            "base_layer_decision": "state_overlay_transient_object"
          }
        ],
        "per_bg_render_facts_by_bg_id": {
          "L21B01": {
            "bg_id": "L21B01",
            "fp_id": "fp_l21_wheelhouse",
            "target_unit_marker_numbers": [
              1,
              2,
              3
            ],
            "dominant_target_unit_marker_number": null,
            "use_numbered_elements": [
              1,
              2,
              3,
              4,
              5,
              6,
              7,
              8,
              9,
              10
            ],
            "ignore_numbered_elements": [
              11,
              12,
              13
            ],
            "base_marker_numbers_to_reference": [
              1,
              2,
              3,
              4,
              5,
              6,
              7,
              8,
              9
            ],
            "transient_marker_numbers_to_describe": [
              10
            ],
            "ignored_state_overlay_marker_numbers": [
              11,
              12,
              13
            ],
            "clean_background_expected": false,
            "applies_to_shots": [
              "S29_Shot1"
            ],
            "depends_on_bg": [],
            "diagnostics": []
          },
          "L21B02": {
            "bg_id": "L21B02",
            "fp_id": "fp_l21_wheelhouse",
            "target_unit_marker_numbers": [
              1,
              2
            ],
            "dominant_target_unit_marker_number": null,
            "use_numbered_elements": [
              1,
              2,
              4,
              5,
              6,
              7,
              8,
              12,
              13
            ],
            "ignore_numbered_elements": [
              10,
              11
            ],
            "base_marker_numbers_to_reference": [
              1,
              2,
              4,
              5,
              6,
              7,
              8
            ],
            "transient_marker_numbers_to_describe": [
              12,
              13
            ],
            "ignored_state_overlay_marker_numbers": [
              10,
              11
            ],
            "clean_background_expected": false,
            "applies_to_shots": [
              "S29_Shot10"
            ],
            "depends_on_bg": [],
            "diagnostics": []
          },
          "L21B03": {
            "bg_id": "L21B03",
            "fp_id": "fp_l21_wheelhouse",
            "target_unit_marker_numbers": [
              1,
              2
            ],
            "dominant_target_unit_marker_number": null,
            "use_numbered_elements": [
              1,
              2,
              4,
              5,
              6,
              7,
              8,
              11
            ],
            "ignore_numbered_elements": [
              10,
              12,
              13
            ],
            "base_marker_numbers_to_reference": [
              1,
              2,
              4,
              5,
              6,
              7,
              8
            ],
            "transient_marker_numbers_to_describe": [
              11
            ],
            "ignored_state_overlay_marker_numbers": [
              10,
              12,
              13
            ],
            "clean_background_expected": false,
            "applies_to_shots": [
              "S29_Shot4"
            ],
            "depends_on_bg": [],
            "diagnostics": []
          }
        },
        "anchor_selection_metadata": {
          "candidate_bg_ids": [
            "L21B01",
            "L21B03"
          ],
          "selection_diagnostics": [
            "anchor selection deferred to W20B (LLM-owned per W19J pivot).",
            "no clean_background_expected=True overlay for this fp — W20F5 fallback widened candidate set to the 2 BG(s) with the fewest transient markers (1); LLM may still pick any of these but must declare the chosen anchor."
          ],
          "selected_anchor_bg_id": null,
          "ramped_fallback": true
        },
        "diagnostics": []
      }
    }
  },
  "step_id": "base_location_dossier",
  "run_id": "405708c6-05b9-4f33-ba06-43c86a1a76b4",
  "resolved_model": "gpt",
  "updated_at": "2026-07-16T21:55:25.313632+00:00",
  "project_config_snapshot": {}
}