{
  "completed_step": "C356",
  "next_proposed_step": "C357",
  "question": "Derive the three-row construction from the source offset and lifespan constants, then exhaust the held context/Gear/SP-rail menu to determine which settings support all three rows together.",
  "reason_selected_after_current_result": "The finite pivot census found a repeated structure. Its evidential value now depends on isolating the independent source constants and testing whether the same pattern survives the declared alternatives.",
  "executed": false,
  "authorization_remaining": 7,
  "fixed_scope": "Mirror/529; regular Gears Noah/Shem/Flood only; SP companion local. Fixed source inputs, no canonical/graph changes."
}