{
  "completed_step": "C388",
  "next_proposed_step": "C389",
  "question": "Reflect the source-qualified E/J square through each of the two already recorded17K corner exchanges and test every resulting point against the frozen cumulative menu. Preserve ancestry phases and distinguish algebraic conjugacy from cumulative source availability.",
  "reason_selected_after_current_result": "The regular strip is now complete within its finite domain. The Mirror/529 focus makes its compatibility with the original cumulative counterparts the next decisive bounded test.",
  "executed": false,
  "authorization_remaining": 5,
  "fixed_scope": "Mirror/529; regular Gears Noah/Shem/Flood only; SP companion local. Fixed source inputs, no canonical/graph changes."
}