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feat(bb_wifi): gateway-reachability probe worker (observe-only, no action) (#679)

- phase 1 of B1-518 (egress-recovery SSOT), stacked on jae/egress-classify
- dedicated bb_timer worker task (MODE B, not the shared bb_timer_disp/FSM
  eval task) - bb_wifi_ping blocks up to timeout+500ms, fatal on a shared task
- reuses wifi_reconn_policy_on_egress_probe() against a SEPARATE observe-owned
  wifi_reconn_state_t, never the live FSM state
- DISCARDS the returned wifi_reconn_action_t - no restart_sta/
  request_recovery/esp_wifi_* call is ever made; this discard is the
  observe/act boundary per #578 (a bare gateway ping must not trigger
  recovery on its own)
- new bb_wifi_get_gateway_status() accessor + bb_wifi_gw_status_t, recorded
  under a dedicated critical section (gw_reachable, gw_fail_streak,
  cumulative probe/fail counts, last_gw_probe_ms via bb_clock_now_ms64)
- gw_dead_count: counts times the classifier would have fired
  WIFI_RECONN_ACTION_RECONNECT_NOW; counted, never acted on
- clock sample moved outside the critical section (nothing that can
  block/alloc/lock stays inside the lock)
- Kconfig: BB_WIFI_GW_PROBE_ENABLE (opt-in, default n - not imposed on
  every consumer; enable per-board in sdkconfig), _PERIOD_S/_TIMEOUT_MS/
  _FAILS/_STACK/_PRIORITY, canonical CONFIG_ bridge
- host stub + BB_WIFI_TESTING bb_wifi_host_set_gateway_status() hook,
  gw_dead_count round-trips through the hook
- examples/smoke sdkconfig.defaults.esp32{,c3} set
  CONFIG_BB_WIFI_GW_PROBE_ENABLE=y so CI still exercises the worker even
  though it defaults off

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