{
  "contractVersion": "1.0.0",
  "classes": [
    {"code":"SOURCE","description":"Original source, license, schema or policy evidence"},
    {"code":"RUNTIME","description":"Build, test, migration, performance or operational evidence"},
    {"code":"RESEARCH","description":"Frozen backtest, OOS, calibration, PBO/DSR or model-comparison evidence"},
    {"code":"RELEASE","description":"Approved release bundle with required runtime and governance artifacts"},
    {"code":"AUDIT","description":"Immutable decision, review, correction and chain-of-custody evidence"}
  ],
  "statusTransitions": {
    "IMPLEMENTATION_TEMPLATE": ["STATIC_VALIDATED"],
    "STATIC_VALIDATED": ["BUILD_VALIDATED"],
    "BUILD_VALIDATED": ["DB_REHEARSED"],
    "DB_REHEARSED": ["SHADOW_READY"],
    "SHADOW_READY": ["PILOT_REVIEW_REQUIRED"]
  },
  "forbiddenShortcut": "No state may be inferred from file presence or document version number."
}