{"version":"2026-09-11-alpha-1","purpose":"Make evidence freshness, challenge, supersession, and revocation explicit instead of treating a past observation as permanently current.","principle":"evidence has a lifecycle; absence of current evidence remains unknown rather than silently becoming true or false","states":["current","stale","challenged","superseded","revoked","unknown"],"recommended_fields":{"observed_at":"When this evidence was directly observed or produced.","valid_until":"Optional explicit evidence horizon after which the evidence must be treated as stale unless re-observed.","freshness_state":"current | stale | unknown","challenge_state":"unchallenged | challenged | resolved | unknown","challenged_at":"When a challenge was recorded, if any.","supersedes":"Stable evidence or claim identifier replaced by this record, if any.","superseded_by":"Stable evidence or claim identifier that replaced this record, if known.","revoked_at":"When the issuer or steward explicitly withdrew this evidence, if applicable.","revocation_reason":"Bounded machine-readable reason for withdrawal when available.","source_version":"Policy, schema, tool, or contract version under which the evidence was produced."},"rules":["stale is not false","unknown is not failed","superseded evidence remains historical evidence but is not the current decision basis","revocation must not be represented as deletion of history","stronger direct evidence should outrank declaration-only evidence","conflicting evidence should remain visible as conflict rather than being silently collapsed"],"authority_created":false,"certification_implied":false}