{
  "completed_step": "C420",
  "next_proposed_step": "C421",
  "question": "Determine whether any two sourced E pivots, or any finite positive E/P/J word with the same whole-map slope, can realize the new held3899 squared-E map while keeping an admitted intermediate. Use exact affine algebra and the fixed regular coordinate menu.",
  "reason_selected_after_current_result": "One squared-E endpoint survived. Before treating it as a path, test whether changing sourced pivots can repair the sole missing intermediate without changing the actual affine map.",
  "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."
}