{
  "schema_version": "0.1-draft",
  "purpose": "placeholder contract for future FIT-to-sidecar sync pipeline",
  "fields_target": [
    "power_w",
    "speed_kmh",
    "heart_rate_bpm",
    "cadence_rpm",
    "gps"
  ],
  "sync_methods": [
    "auto_timestamp_plus_offset",
    "manual_offset_ms"
  ],
  "notes": "Current release copies existing JSON sidecars only; FIT parsing is not implemented yet."
}