dangernoodle-io / breadboard / 24975464968

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fix(bb_log): async console writer to prevent TX backpressure log mutex panic (#106)

- add log_writer_msg_t queue (depth 32) and bb_log_writer task (prio 1)
- s_log_vprintf formats once then enqueues non-blocking; never calls s_orig_vprintf directly
- writer task drains queue with fwrite/fflush; if usb-cdc tx blocks only writer stalls
- bb_log_stream_init creates queue + spawns task before installing vprintf hook
- drop counter s_writer_dropped tracks overflow when queue is full
- sse ringbuf path unchanged

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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