dangernoodle-io / breadboard / 24951344760

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feat(bb_mdns): async browse wrapper for peer discovery (#90)

wraps esp-idf's mdns_browse_new/_delete so consumers can discover
other _<service>._<proto> peers on the lan via callbacks. first
consumer is taipanminer's forthcoming knot fleet view (per
ouroboros plan #3); per ta-235 the consumer must not call esp-idf
directly.

- bb_mdns_browse_start(service, proto, on_peer, on_removed, ctx)
- bb_mdns_browse_stop(service, proto) — idempotent
- bb_mdns_peer_t exposes instance_name, hostname, ip4, port, txt
  pairs; lifetime is the callback only
- subscription table sized 4 (one per service realistic)
- host stub returns BB_OK (mdns not exercisable on host)
- host tests cover arg validation + idempotency

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