{
  "completed_step": "C407",
  "next_proposed_step": "C408",
  "question": "Apply the fixed−500 translation to the two primary C343 Noah-held1058→1150→1250 ladders and compare their source endpoints with the C363 Shem-held squared-E construction. Identify precisely which intermediate roles remain sourced, preserving the original two17K contexts and all recorded phase qualifications.",
  "reason_selected_after_current_result": "The new source correspondence is complete for the return-loop grammar, but the older double-E ladder has different intermediate roles. Testing it can connect the two existing constructions while exposing the exact source boundary.",
  "executed": false,
  "authorization_remaining": 6,
  "fixed_scope": "Mirror/529; regular Gears Noah/Shem/Flood only; SP companion local. Fixed source inputs, no canonical/graph changes."
}