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## What changed - Resolve the full rollout lineage when loading model context for paginated threads. - Reverse-scan each lineage segment up to its recorded byte boundary, stopping at segment metadata and preserving the requested thread's canonical session metadata. - Add a bounded reverse-scanner constructor for scanning a frozen JSONL prefix. ## Testing - Cover frozen-prefix reverse scans and nested lineages whose root rollout has been archived. GitOrigin-RevId: 8b97da43a263b7bd09cb7883450bb19eba5f195f