tests: capture audioio runner results from F405 (all 5 PASS)

run_serial_tests.py output from a Feather STM32F405 Express,
captured via tee. Tests 1–5 (WAV playback, pause/resume, looping
sine, deinit/re-init, stereo) all pass; manual Test 6 (soft-reset
cleanup) is documented separately.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>