{
  "completed_step": "C359",
  "next_proposed_step": "C360",
  "question": "Test this two-segment source mapping against every C319 control, including SP companion and source-membership failures. Derive the exact endpoint residuals and determine whether it selects the cumulative settinga as well as the regular settingb.",
  "reason_selected_after_current_result": "The positive endpoint construction is exact at the two retained primary fields. The fixed control menu can distinguish structural selectivity from restating the existing regular2K condition.",
  "executed": false,
  "authorization_remaining": 4,
  "fixed_scope": "Mirror/529; regular Gears Noah/Shem/Flood only; SP companion local. Fixed source inputs, no canonical/graph changes."
}