ChunkInfoIsBitIdenticalToItsValueBeforeTheExtraction never passed on Linux: at c86f28e93 (the commit that added it) it already measures 1039274088 for the second observer where the recording says 1039274086, and base 12dfcef5, the code the recording claims to be taken from, measures the same ...088 on Linux (CultMath 0.4.1 and 0.5.0 alike). The sensor's bearing term (acos, curve) is libm arithmetic, which rounds differently on Windows, where the recording was made. It is a host-class recording read as universal, not a regression: no commit moved it.
The pin is now per host class like the two-AI digest (ruling replays-per-host-class): windows-x64 keeps the original recording, linux-x64 is base 12dfcef5 run on Linux, and the current code equals it. A host with no recording fails and prints its bits. RunStartTests.HostClass is now internal, the one host-class name.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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