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Temporal metadata fields (validFrom, validUntil, isCurrent, isRevisionOf) on UKO InformationUnit nodes enable revision chain tracking: when code changes, old nodes are marked historical and new revision nodes are created with back-links. Three storage tiers (hot/warm/cold) filter nodes by temporal scope (current/recent/all) with configurable retention (warm_retention_hours default 24h, cold_retention_days default 90d). Includes TemporalMetadata, TemporalNode, RevisionChain, TierQueryResult, TierRetentionConfig frozen domain models, TemporalBackend protocol, InMemoryTemporalBackend stub, TemporalService with structlog and DI, BackendSet.temporal typing upgrade from object|None to TemporalBackend|None. 67 Behave scenarios, 8 Robot Framework tests, ASV benchmarks, and reference documentation. ISSUES CLOSED: #577