dangernoodle-io / breadboard / 24969197210

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feat(bb_mdns): coalesce txt updates and force unsolicited re-announce (#99)

- add bb_mdns_announce() to public header (portable, outside ESP_PLATFORM guard)
- move bb_mdns_set_txt() declaration outside ESP_PLATFORM guard so host stubs compile
- esp-idf backend: one-shot esp_timer (100 ms) coalesces rapid set_txt calls;
  fires mdns_netif_action(MDNS_EVENT_ANNOUNCE_IP4|IP6) on the STA netif
- bb_mdns_announce() bypasses coalescing delay (fires immediately via delay=0)
- timer is created lazily at service start, deleted on disconnect/shutdown
- timer not armed when service hasn't started (pending path is unaffected)
- host stub: bb_mdns_set_txt and bb_mdns_announce increment test counters
- new bb_mdns_host_test_hooks.h exposes counters and bb_mdns_host_reset()
- setUp() now calls bb_mdns_host_reset() to isolate tests
- 5 new host tests covering announce counter, set_txt counter separation,
  null-safety, and reset; 274/274 pass, 100% coverage

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

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