{
  "after": "C300",
  "chosen_next_step": "C301: broaden the regular endpoint side to the existing528 qualified contexts while holding all cumulative fields, bridges and anchors fixed.",
  "reason": "The MT-only biography limit may reflect its selected context. The already verified wider register permits a finite test for other source-qualified life segments without new events.",
  "next_step_executed_within_this_step": false,
  "effort": "High sufficient",
  "limits": [
    "Noah cumulative fields are derived source records, not independent new attestations.",
    "Absence is limited to the declared cumulative domain.",
    "Preserved duration alone does not identify full biographies."
  ]
}