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feat(bb_wifi): emit restart_sta_count, disconnect_rssi, recovery reason histogram (#620)

- add static s_restart_sta_count incremented only inside bb_wifi_restart_sta()
  to prevent double-counting vs callers
- add s_last_rssi cached in rssi_refresh_work_fn (platform/espidf/bb_wifi/bb_wifi.c:88)
  under s_ap_mux, snapshotted to s_disconnect_rssi on WIFI_EVENT_STA_DISCONNECTED
  before AP record is torn down (no esp_wifi_sta_get_ap_info in disconnect handler)
- add bb_wifi_get_reason_histogram() delegating to wifi_reconn_get_histogram()
- wire all three fields into bb_wifi_emit_section() with compact histogram view:
  sentinels 99/100/101 + single highest non-zero standard reason
- mirror same fields into bb_pub_wifi snapshot/serializer so REST==SSE==sink bytes
- host stubs return 0; BB_WIFI_TESTING hooks for restart_sta_count + disconnect_rssi
- add 11 new unity tests covering defaults, roundtrips, emit field presence,
  sentinel key presence, and zero-histogram behavior on host

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

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