Versioned Turn Provenance
Kind: algorithm
Record: algorithms:versioned-turn-provenance
Canonical: Algorithms
Closure: Dependencies in load order
Persist each accepted model turn as an append-only, mode-tagged, schema-versioned, causally ordered record with change-only provenance, so the turn history is a queryable, auditable log and a turn is never graded against a schema version its stored state never saw.
Listed in Algorithm contracts, after Loop-Owned Mode Selection and before Mode Contract Validation.