{
  "number": 401,
  "date": "2026-09-24",
  "title": "Circuit source domain and529-lattice obstruction",
  "question": "Do the sourced circuit maps preserve the frozen regular field,2K/17K spans, or a529-spaced lattice?",
  "authorization": "User authorized next10 bounded steps C394–C403; next question reassessed after each completed result.",
  "scope": "Mirror/529; regular Gears Noah/Shem/Flood only; SP companion local. Fixed source inputs, no canonical/graph changes."
}