chess 4491caf1ad
Stream rollout records during thread history materialization ( #54639 ) ...
## Why
Thread history materialization allocated a buffer for the entire unread rollout suffix before processing records, increasing memory use for large rollouts.
## What changed
Read records incrementally with a buffered reader bounded to the captured file end. Reuse the line buffer, preserve trailing partial records for the next pass, and report unexpected EOF if the rollout shrinks during reading.
## Testing
Extend the partial-line boundary test with 64 KiB of padding per record to verify byte offsets and deferred processing until the final newline is durable.
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4491caf1ad