{
  "completed_step": "C421",
  "next_proposed_step": "C422",
  "question": "Reconstruct the profile, boundary controls and new squared-E endpoint directly from current source excerpts, and check inherited quarter-offset components. Separate source-prescribed relations from derived comparisons, fixed-pivot seasonal action and jointly shifted endpoint comparisons before final synthesis.",
  "reason_selected_after_current_result": "The algebraic path question is closed. A focused source and component audit is now the most useful final research step before C423 synthesis and recovery packaging.",
  "executed": false,
  "authorization_remaining": 2,
  "fixed_scope": "Mirror/529; regular Gears Noah/Shem/Flood only; SP companion local. Fixed source inputs, no canonical/graph changes."
}