dangernoodle-io / breadboard / 29136908078

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feat: bus-shape the wifi.net publish seam via bb_emit_fn + bb_event_emit (#810)

- add bb_emit_fn (bb_core/bb_emit.h) -- generic bus-shaped (topic, id,
  payload, size) callback typedef, no bb_event types
- add bb_event_emit (bb_event.h/bb_event_common.c) -- string-keyed,
  void-return peer of bb_event_post; register-or-lookup then post,
  logs on internal failure since an emit sink has no caller to
  propagate a bb_err_t to
- bb_wifi gains an independent generic emit slot (bb_wifi_set_emit +
  bb_wifi_emit_baseline) alongside its existing typed net-event sink
  (bb_wifi_set_net_event_sink), which is unchanged and keeps firing;
  bb_wifi stays bb_event-free
- fire the generic slot at the same three STA lifecycle edges
  (got_ip/disconnect/lost_ip) via bb_wifi_publish_net_event, with the
  same ip-blanking-on-error and reason-handed-in-not-read-back
  discipline as the typed seam
- delete examples/smoke/main/wifi_event_bridge.{c,h} (the PR2
  smoke-local bridge component) and replace with a 2-line handwire in
  entry_espidf.c: bb_wifi_set_emit(bb_event_emit) + bb_wifi_emit_baseline()
- add host tests for bb_event_emit and bb_wifi_publish_net_event/
  bb_wifi_emit_baseline, including the ip-blanking-on-error branch (a
  new bb_wifi_test_set_ip_str_fail host test hook)

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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