{
  "after": "C305",
  "chosen_next_step": "C306: Audit the actual phase components and all admitted Gear1 Noah-rail/Flood-boundary alternatives, recording which fixed interface each600-year alternative changes.",
  "reason": "The integer-center obstruction is established; checking the available phase and selector choices will determine whether it is a labeling issue or a stable compatibility boundary.",
  "next_step_executed_within_this_step": false,
  "effort": "High sufficient",
  "limits": [
    "599 and601 are valid off-diagonal source comparisons.",
    "The result does not invalidate the independently bound C302600 segments.",
    "The formal half-index is not added to the annual source field."
  ]
}