{
  "after": "C293",
  "chosen_next_step": "C294: release the common annual offset, retaining the fixed13K bridge and8K reflection, and test the full two cumulative fields against the existing regular register.",
  "reason": "The common-offset family fails, but the full fields contain additional source indices. A bounded source search can distinguish a true closure boundary from a restriction caused by the chosen pairing.",
  "next_step_executed_within_this_step": false,
  "effort": "High sufficient",
  "limits": [
    "The first inner member is a generated source image, not a historical event at1587.",
    "No row-dependent comparison axis is adopted.",
    "The negative result is restricted to common-offset rows."
  ]
}