{
  "format_version": 1,
  "save_slice_id": "packed-event-locomotive-availability-overlay-save-slice",
  "source": {
    "description": "Tracked save-slice document proving scalar locomotive availability descriptors can import through overlay-backed catalog context.",
    "original_save_filename": "captured-locomotive-availability-overlay.gms",
    "original_save_sha256": "locomotive-availability-overlay-sample-sha256",
    "notes": [
      "tracked as JSON save-slice document rather than raw .smp",
      "uses grounded lower-band locomotive ids to prove overlay-backed scalar resolution"
    ]
  },
  "save_slice": {
    "file_extension_hint": "gms",
    "container_profile_family": "rt3-classic-save-container-v1",
    "mechanism_family": "classic-save-rehydrate-v1",
    "mechanism_confidence": "grounded",
    "trailer_family": null,
    "bridge_family": null,
    "profile": null,
    "candidate_availability_table": null,
    "named_locomotive_availability_table": null,
    "special_conditions_table": null,
    "event_runtime_collection": {
      "source_kind": "packed-event-runtime-collection",
      "mechanism_family": "classic-save-rehydrate-v1",
      "mechanism_confidence": "grounded",
      "container_profile_family": "rt3-classic-save-container-v1",
      "metadata_tag_offset": 28928,
      "records_tag_offset": 29184,
      "close_tag_offset": 29696,
      "packed_state_version": 1001,
      "packed_state_version_hex": "0x000003e9",
      "live_id_bound": 33,
      "live_record_count": 1,
      "live_entry_ids": [33],
      "decoded_record_count": 1,
      "imported_runtime_record_count": 0,
      "records": [
        {
          "record_index": 0,
          "live_entry_id": 33,
          "payload_offset": 29186,
          "payload_len": 120,
          "decode_status": "parity_only",
          "payload_family": "real_packed_v1",
          "trigger_kind": 7,
          "one_shot": false,
          "compact_control": {
            "mode_byte_0x7ef": 7,
            "primary_selector_0x7f0": 0,
            "grouped_mode_0x7f4": 2,
            "one_shot_header_0x7f5": 0,
            "modifier_flag_0x7f9": 0,
            "modifier_flag_0x7fa": 0,
            "grouped_target_scope_ordinals_0x7fb": [0, 0, 0, 0],
            "grouped_scope_checkboxes_0x7ff": [1, 0, 0, 0],
            "summary_toggle_0x800": 1,
            "grouped_territory_selectors_0x80f": [-1, -1, -1, -1]
          },
          "text_bands": [],
          "standalone_condition_row_count": 0,
          "standalone_condition_rows": [],
          "grouped_effect_row_counts": [2, 0, 0, 0],
          "grouped_effect_rows": [
            {
              "group_index": 0,
              "row_index": 0,
              "descriptor_id": 250,
              "descriptor_label": "Big Boy 4-8-8-4 Availability",
              "target_mask_bits": 8,
              "parameter_family": "locomotive_availability_scalar",
              "opcode": 3,
              "raw_scalar_value": 42,
              "value_byte_0x09": 0,
              "value_dword_0x0d": 0,
              "value_byte_0x11": 0,
              "value_byte_0x12": 0,
              "value_word_0x14": 0,
              "value_word_0x16": 0,
              "row_shape": "scalar_assignment",
              "semantic_family": "scalar_assignment",
              "semantic_preview": "Set Big Boy 4-8-8-4 Availability to 42",
              "recovered_locomotive_id": 10,
              "locomotive_name": null,
              "notes": []
            },
            {
              "group_index": 0,
              "row_index": 1,
              "descriptor_id": 298,
              "descriptor_label": "VL80T Availability",
              "target_mask_bits": 8,
              "parameter_family": "locomotive_availability_scalar",
              "opcode": 3,
              "raw_scalar_value": 7,
              "value_byte_0x09": 0,
              "value_dword_0x0d": 0,
              "value_byte_0x11": 0,
              "value_byte_0x12": 0,
              "value_word_0x14": 0,
              "value_word_0x16": 0,
              "row_shape": "scalar_assignment",
              "semantic_family": "scalar_assignment",
              "semantic_preview": "Set VL80T Availability to 7",
              "recovered_locomotive_id": 58,
              "locomotive_name": null,
              "notes": []
            }
          ],
          "decoded_actions": [],
          "executable_import_ready": false,
          "notes": [
            "scalar locomotive availability rows use overlay-backed catalog context"
          ]
        }
      ]
    },
    "notes": [
      "overlay-backed descriptor-driven named locomotive availability sample"
    ]
  }
}