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Neil
28d936e030
* perf(native-chat): bound journal reads during paged catch-up * perf(native-chat): reduce the journal once per catch-up run, not per page Bounding the SQL read per page left the JS side still O(total items) per page: every page re-reduced the whole timeline and rebuilt the live-item map, and the byte-shrink loop rebuilt it again on each halving. A catch-up run is a synchronous loop with no await between pages, so the reduced timeline is loop-invariant. `createAgentSessionCatchUpReader` holds one snapshot for the run and re-reduces only if the journal cursor actually moved, and the projection's live-item / alias / submission-byte indexes memoize on the snapshot arrays the reducer rebuilds on change. Per catch-up over a 8,000-message backlog: 40 timeline reductions to 1, reduce+project time 24.3ms to 3.5ms, end-to-end 134.6ms to 111.3ms.