{
  "after": "C277",
  "chosen_next_step": "C278: audit the reverse602 relation and the finite domains of the two-year shifts, alongside the retained598/600 comparisons.",
  "reason": "The four successful lower-index correspondences suggest an inverse shift; checking its actual domain will distinguish a partial relation from a closed register action.",
  "next_step_executed_within_this_step": false,
  "effort": "High sufficient",
  "limits": [
    "Cumulative annual membership is not separate event attestation.",
    "Four derived comparisons do not add stored paths or independent witnesses.",
    "Missing regular counterparts stay missing; no extra Gear is introduced."
  ]
}