{
  "step": "C267",
  "date": "2026-09-24",
  "task": "Classify signed2500/6250/7500markers in the fixedC266 local chart",
  "chart": "eta(x)=1000*(x-1)",
  "global_mirror": "x->-x; JanuaryAD1 unchanged",
  "local_reflection": "J1(x)=2-x; JanuaryAD2 junction",
  "primary_signed_markers": [
    2500,
    6250,
    7500
  ],
  "dependent_companion_marker": 5750,
  "companion_reason": "Explicit5750->6250 ladder and6000\u00b1250 bracket in axis report\u00a715.2",
  "core_domain": "48source-tagged annual boundaries in six fields: translated Flood and reflected translated Shem forMT_ON/SP_OFF/LXX_OFF",
  "auxiliary_domain": "24already-recorded unreflected Shem boundaries; separately reported, never inserted into core",
  "midpoint_domain": "six complete field midpoints plus the two admittedSP radius5 arms, no arbitrary pair hunt",
  "classifications": [
    "source-projected integer pair center",
    "individual seasonal component",
    "generated midpoint",
    "whole seasonal envelope length"
  ],
  "constraints": [
    "no new historical endpoint identities",
    "no new Gear or cumulative Gear",
    "no change to529/Key values",
    "no primer reopening",
    "no z-law",
    "no new global axis"
  ],
  "status": "bounded domain frozen before verifier execution"
}