The "session switch: newer file triggers replay" test relied on
wall-clock mtimes to decide which .jsonl was newest. Under timing
pressure the two files' mtimes could tie, so the reader never switched
and the test timed out — it failed ~60% of full-suite runs (measured),
the source of the intermittent red I'd been waving off as "a flake".
Backdate session A to a fixed past time so the newer file is
unambiguously newer; the switch is now guaranteed regardless of load.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.7
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