D1 diagnostic codec normal
"/Users/guman/Documents/Codex/2026-10-04/https-pcbapartner-com-smart-home-pcba/work/diag-build/test_diag"
PASS: D1 CRC, limits, invalid-field rejection, failure atomicity; 100000 random byte lines.

D1 diagnostic codec ASan/UBSan
"/Users/guman/Documents/Codex/2026-10-04/https-pcbapartner-com-smart-home-pcba/work/diag-sanitize/test_diag"
PASS: D1 CRC, limits, invalid-field rejection, failure atomicity; 100000 random byte lines.
