- the Windows runner image exports MSVC's INCLUDE/LIB; cc-rs was
appending the MSVC SDK headers to MinGW compiles (vcruntime.h not
found)
- oak-worker handshake test helper advertised the input pool's total
byte size as per-slot data bytes (macOS tolerated the oversized
attach; Linux correctly rejects it)
- hw/sw decode comparison tolerance 0.05 -> 0.08 (VideoToolbox's
YUV->RGB legitimately differs by ~1 LSB of intermediate depth)