{
  "Covenant_two_stage_image": "257168/23",
  "SP_two_stage_target": 11416,
  "Covenant_two_stage_residual": "-5400/23",
  "LXX_two_stage_regular_join": "14278/23",
  "LXX_two_stage_cumulative_join": "14278/23",
  "positive_stage_commutator": "5400/23",
  "correction": "The first expectation used the positive-stage sign. Reducing both heads by2700 gives residual−5400/23, not+5400/23; no input changed."
}