{
  "completed_step": "C390",
  "next_proposed_step": "C391",
  "question": "Derive the source equations behind the census and test whether the admitted E/J motif is equivalent, within this fixed domain, to the original common P/J529-side construction. State which relations are forced and which still require source membership.",
  "reason_selected_after_current_result": "The fresh census found no extra contexts. A derivation can separate a structural consequence of500,600 and the operators from apparent numerical corroboration and connect the two finite constructions directly.",
  "executed": false,
  "authorization_remaining": 3,
  "fixed_scope": "Mirror/529; regular Gears Noah/Shem/Flood only; SP companion local. Fixed source inputs, no canonical/graph changes."
}