@maverickcer/env-cap
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    Variable CONTRACT_MODEL_SCHEMA_VERSIONConst

    CONTRACT_MODEL_SCHEMA_VERSION: 3

    Bump only when a reader could misinterpret the new shape (a field changes type/meaning, or is removed) -- NOT for every additive field. Same discipline evidence-model.ts's EVIDENCE_MODEL_SCHEMA_VERSION and src/cli/json.ts's JSON_SCHEMA_VERSION already document.