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## Why Rollout compression skips files that participate in paginated fork lineages because lineage readers rely on byte offsets into the original JSONL. This prevents shared rollout history from being compressed. ## What changed - Add a seekable rollout reader that preserves logical JSONL offsets for plain and zstd-compressed files without materializing compressed data beside the rollout. - Use the reader for lineage validation, model-context replay, and SQLite history projection, including when compression races with a read. - Add the opt-in `local_thread_store_shared_compression` feature. The default mode continues to leave shared lineages uncompressed for compatibility, while the new mode includes referenced sources and fork pointers. - Record the uncompressed size in new zstd frames so common prefix-bound checks can avoid decoding the full file. ## Testing Add coverage for seekable compressed reads, prefix validation across zstd frame shapes, compressed lineage replay and projection, concurrent forks, and compression-mode behavior. GitOrigin-RevId: 83e519f7eabf7448977eff37c55899858cc17a07