{
  "step": "C275",
  "date": "2026-09-24",
  "authorization": "Dean: Proceed with your next best bounded step, with the corrected LXX comparison retained only as supplemental awareness",
  "task": "Provenance audit of C274 premises A/B/C in the supplied original Mirror/529 documents and their immediate source references",
  "premises": {
    "A": "MT closing join: 2m=10580",
    "B": "Common MT/LXX Flood shift: l=m",
    "C": "SP/MT global Flood-interval reflection: m+s=10005"
  },
  "fixed_controls": [
    "File_18 source coordinates",
    "File_09 global Mirror and phase convention",
    "Shem source gap 600",
    "Shem translation increment 598",
    "K=529 and E=25/23"
  ],
  "evidence_domain": [
    "Supplied comprehensive Mirror handoff, especially sections 3,7,8,9,14",
    "Supplied bilateral Mirror report, especially section 6",
    "Supplied 529-axis report, especially sections 1 and 16 and Appendix D",
    "File_18 sections 6B,6C,6D; compressed 5290-to-Christ annotation",
    "File_09 source-node and Mirror/phase controls",
    "3+7x529 branch identified as S11 by the supplied axis report"
  ],
  "source_classes": [
    "chronology-coordinate control",
    "declared placement or target",
    "derived relation conditional on placement",
    "source-qualified subdivision of an already retained span",
    "fixed coordinate/phase convention"
  ],
  "allowed_exact_checks": [
    "Bind excerpt text and line ranges to frozen documents",
    "Check direct equation restatements and source deltas needed to assess dependence",
    "Verify user supplemental arithmetic under existing paired crossover convention"
  ],
  "supplement_policy": "Record Creation 5494->2970, Jared 4534->3930, reflected AD-anchor spans 1564/2484, expansions 1700/2700, Creation/Jared offsets 1380/880 and 920->1000 difference; supersede AD3746/2300. Do not use these as C275 premise evidence or redirect research.",
  "excluded": [
    "No historical campaign rerun",
    "No new event/anchor search",
    "No parameter selection or chart refit",
    "No extension of regular Gears beyond Noah/Shem/Flood",
    "No canonical edits",
    "No primer or 598-relaxation study",
    "No C276 execution"
  ],
  "review_type": "Author provenance and arithmetic consistency review; no new independent-agent review",
  "inference_limit": "Exact source excerpts and arithmetic can be machine checked; documentary classification and necessity judgments remain authored and bounded to the inspected evidence."
}