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liquidraver
f06c472e87
Single ZephyrUSBCDC module owns the usbd context, 1200-baud DFU detection, and DTR transitions for both roles. The boot banner now blocks on a k_event signalled by the usbd_msg_callback when DTR transitions high — host attached → wakes immediately; no host → bounded timeout (2 s repeater, 1 s companion). Replaces the fixed k_sleep delays in both mains. Deletes the companion's 10 s DTR-polling work — line state changes arrive as events now, same callback handles disconnect (resets V3 parser, flips active_iface) and DFU touch (reboots to bootloader). Side effect: prod companion no longer enumerates a phantom CDC ACM port (CONFIG_LOG=n skips the whole stack instead of auto-initing an unused device).