Previously: flash firmware → wait for 120s boot window → fill form → send over serial
Now: fill WiFi form → flash firmware → device reboots → send over serial immediately
The provisioning window opens at boot. With credentials already collected, the
browser sends the payload the moment the flash+reboot cycle completes — no human
action required and no race condition. Flash step now handles both flashing and
provisioning in one automated sequence (progress 0→80% flash, 80→100% provision).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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