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## What changed - Add `HistoryPosition` to identify a source thread and an exclusive rollout prefix by ordinal and JSONL byte offset. - Add optional `history_base` metadata to `SessionMeta` so a thread can record an inherited prefix of another paginated rollout. - Default missing `history_base` metadata to `None` and omit it when unset to preserve compatibility with existing rollout metadata. ## Testing - Verify that legacy session metadata without `history_base` deserializes with no inherited history position. GitOrigin-RevId: 3b2b07a2dfee793d3b37b0a60529f856f167dbc1