模型算出了 144.22 米，谁来证明它没算错？

geotask:
  id: "gt02-independent-distance-verification"
  name: "GT02 Independent Distance Verification"
  schema_version: "1.0"

space:
  crs:
    type: "local_cartesian"
    identifier: "local_xy_m"
  horizontal_unit: "meter"
  coordinate_order: ["x", "y"]

objects:
  takeoff:
    type: "point"
    coordinates: [0, 0]
  school:
    type: "point"
    coordinates: [120, 80]

operator_set:
  - distance_2d

tasks:
  - id: "verify_takeoff_to_school_distance"
    family: "measurement"
    goal: "Calculate the Euclidean distance between takeoff and school."
    assertions:
      - id: "takeoff_to_school_distance"
        operator: "distance_2d"
        object_refs: ["takeoff", "school"]
        unit: "meter"

execution:
  mode: "model_then_local_verify"

output_contract:
  format: "structured"
  required_fields:
    - "takeoff_to_school_distance"
    - "assurance_level"
    - "verification_status"

instructions_for_model:
  - "Return the numeric distance in meter."
  - "Mark the model-produced result as model_generated."
  - "Do not claim local_deterministic verification unless a separate deterministic executor has run."