Restrict occupancy to personal devices only (phones/wearables)

Previously counted every non-infrastructure device toward OCCUPIED state,
causing TVs and other stationary equipment to falsely indicate occupancy.

Now only MACs in device_labels or personal_devices count. Everything else
is observed but ignored for presence purposes.

net_alerter/net_alerter.py

@@ -901,10 +901,15 @@ def _update_occupancy_state_unlocked() -> None:
     """
     global location_occupancy
 
-    # Count active enrolled devices that are not infrastructure (in known_devices, not marked departing, not infrastructure IP)
+    # Count only explicitly configured personal devices (phones/wearables in device_labels or personal_devices)
+    # Ignores all other devices — TVs, smart home, unknown equipment, etc.
+    def _is_personal(mac: str) -> bool:
+        n = _normalize_mac(mac)
+        return n in device_labels or n in personal_devices
+
     active_enrolled_count = 0
     for mac, dev in known_devices.items():
-        if not dev.get('departing', False) and dev['ip'] not in infrastructure_ips:
+        if _is_personal(mac) and not dev.get('departing', False) and dev['ip'] not in infrastructure_ips:
             active_enrolled_count += 1
 
     # Determine new occupancy state
@@ -915,8 +920,8 @@ def _update_occupancy_state_unlocked() -> None:
         if new_occupancy == "OCCUPIED":
             present = []
             for mac, dev in known_devices.items():
-                if not dev.get('departing', False) and dev['ip'] not in infrastructure_ips:
-                    label = device_labels.get(_normalize_mac(mac)) or dev.get('vendor') or mac[-8:]
+                if _is_personal(mac) and not dev.get('departing', False) and dev['ip'] not in infrastructure_ips:
+                    label = device_labels.get(_normalize_mac(mac)) or mac[-8:]
                     present.append(label)
             msg = f"[NET] Location: OCCUPIED ({', '.join(present)})"
         else:
@@ -925,7 +930,7 @@ def _update_occupancy_state_unlocked() -> None:
         send_alert(msg)
 
         location_occupancy = new_occupancy
-        logging.info(f"Location occupancy updated to {location_occupancy} ({active_enrolled_count} enrolled non-infra devices active)")
+        logging.info(f"Location occupancy updated to {location_occupancy} ({active_enrolled_count} personal devices active)")
 
 
 def update_occupancy_state() -> None: