The fold capped the timeline at a step count, so long sessions lost
older turns entirely in turn granularity. When the step bound is
exceeded, the timeline is now trimmed to the newest 300 WHOLE turn runs
(1500-step backstop for pathological many-step turns) — a turn is never
cut in half, and turn mode always shows the full recent turn range.
The harness session log itself has no event cap, so this was the only
limiter.
bowenliang123
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