# Evolution and Versioning

New movements, laws, crises, technologies, parties, and interpretations enter through the candidate ledger. Add capture date, source type, claim layer, confidence, perspective, and uncertainty. Search aliases and mechanisms before creating a node. Split a node when distinct mechanisms are being forced together; merge only as a linked view, preserving lineage.

A release never overwrites discovery. Stable revisions receive new versions and migration notes. Current claims have review dates. A Sentinel assessment links to the immutable Engine snapshot and any derived presentation variant.
