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## Why `thread/revert` keeps the logical thread ID while selecting a new immutable rollout. Using the thread ID for persisted history can therefore read or update the wrong rollout. ## What changed - Centralize resolution of a thread's current rollout across live writers, SQLite metadata, and filesystem fallbacks. - Key history materialization, lineage traversal, paging, turn lookup, and fork boundaries by immutable rollout ID while retaining the thread ID for the logical thread. - Treat SQLite's selected rollout as authoritative for paginated threads so a filesystem scan cannot select an older rollout after `thread/revert`. ## Testing Add a regression test showing that update-ordinal item paging reads from the selected rollout ID when it differs from the thread ID. GitOrigin-RevId: 1101e548a6e6c6d319996e24cb650e5b03ab7fbb