{
  "after": "C303",
  "chosen_next_step": "C304: Check the two17K overlaps against retained original Report09 interfaces and the unchanged C127 graph, preserving interior path provenance.",
  "reason": "Only two positions satisfy the joint conditions; selective provenance inspection can now decide which have an already stored source route.",
  "next_step_executed_within_this_step": false,
  "effort": "High sufficient",
  "limits": [
    "The endpoint intersection does not manufacture an interior path.",
    "MT and SP Flood endpoints in the table have different source bindings.",
    "Missing values are absent in the held domain, not universally impossible."
  ]
}