The flash flow's boot-log capture decoded serial lines and wrote text to a
stdout that the scrubbed child env leaves on cp1252. The ESP32-C6 release
firmware logs U+2192, so the capture died mid-boot (bootLog.captured=false);
an earlier abort would have hidden the CSI evidence and reported a good
flash as unvalidated. Write raw bytes instead. Regression test forces
PYTHONIOENCODING=cp1252 through a stand-in serial module (fails without
the fix). ADR-373 Amendment 2 records the real C6 flash evidence.
Co-Authored-By: claude-flow <ruv@ruv.net>
ruv
b25729acd6