dangernoodle-io / breadboard / 28614085006

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feat(bb_net_health): net_mode discriminator enum + associated accessor; consolidate roam counters to net-health SSOT (#670)

- bb_wifi_is_associated() public accessor wrapping esp_wifi_sta_get_ap_info() == ESP_OK (boot-safe, mirrors the no-IP watchdog check in wifi_reconn.c); host stub test-injectable via bb_wifi_test_set_associated()
- pure bb_net_health_classify_mode(associated, has_ip) -> bb_net_mode_t (OK / NO_IP / NOT_ASSOCIATED), 100% branch coverage
- surfaced net_mode (string) + associated/has_ip (bool) on GET /api/diag/net and the net.health SSE topic
- fixed a serialization gap: no_ip_recoveries and roam_count/roam_age_s were captured in bb_net_health_status_t but never emitted on the net.health payload
- removed roam_count/roam_age_s from GET /api/wifi and the "wifi" pub topic per the B1-486 SSOT precedent — discriminators live on /api/diag/net + net.health only, sourced from bb_wifi_get_roam_count()
- observe-only: no new recovery-action call sites (bb_wifi_restart_sta/request_recovery/esp_wifi_connect/disconnect) added anywhere in this diff

1978 of 1978 branches covered (100.0%)

Branch coverage included in aggregate %.

16 of 16 new or added lines in 1 file covered. (100.0%)

3408 of 3408 relevant lines covered (100.0%)

1249.81 hits per line