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The instrument is built (canary auto/re-wait-timeout-probe 83ad0eb3f, binary archived at /sylph-home/re/bin/waitprobe): consecutive timeouts on the same object, per thread, logged at 100 and then every 500 - self-selecting where the global kHighFrequency flag was unusable. The control is measured: a 25-minute Stage 02 run that never froze produced 27 lines, ALL one thread polling one Event at guest VA BE56BB5C with a ~30 ms timeout, whose streak reached 8000 while the game ran perfectly. So the probe is quiet, not silent - the first draft of the cvar help said silent and that is corrected here - and the freeze signal will be a NEW (thread, object) pair rather than the presence of output. Not settled: the freeze did not reproduce this run, so there is no frozen sample to compare against yet. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PMRJjbxLqZtsb5Vb7KunPE