Remove Tailscale exclusion machinery — root cause was a bad .env label

b6:cc was mislabeled as 'Dane iPhone' causing it to be treated as a
personal device. Removing the label fixes the problem without needing
any Tailscale-specific code. Keep mDNS and ARP arrival fixes.

net_alerter/net_alerter.py

@@ -42,11 +42,6 @@ last_departed_time = {}  # {mac: timestamp} when device was actually alerted as
 last_seen = {}  # {mac: float} — updated by passive ARP/mDNS capture
 last_seen_lock = threading.Lock()
 
-# Tailscale peer MACs — excluded from presence monitoring
-# OPi's WireGuard session generates bidirectional L2 traffic that would
-# otherwise keep peer MACs perpetually REACHABLE in the kernel ARP cache.
-tailscale_peer_macs: set = set()
-
 # Interface flap detection — suppresses departure storms
 _flap_window = []          # [(timestamp, mac)]
 _flap_lock = threading.Lock()
@@ -836,50 +831,6 @@ def seed_from_arp_cache():
         logging.error(f"Failed to seed from ARP cache: {e}")
 
 
-def seed_tailscale_peers() -> None:
-    """Populate tailscale_peer_macs with MACs of active Tailscale peer endpoints.
-
-    OPi has a WireGuard session to each Tailscale peer. The peer's LAN IP is the
-    direct endpoint, so bidirectional L2 traffic keeps it REACHABLE in the kernel
-    ARP cache — generating ARP opcode 1 frames that would refresh last_seen and
-    falsely prevent departure alerts. Exclude them entirely.
-    """
-    global tailscale_peer_macs
-    try:
-        result = subprocess.run(
-            ['tailscale', 'status', '--json'],
-            capture_output=True, text=True, timeout=5
-        )
-        if result.returncode != 0:
-            logging.warning("tailscale status failed — no Tailscale peer exclusions")
-            return
-        status = json.loads(result.stdout)
-        peer_ips = set()
-        for peer in status.get('Peer', {}).values():
-            # CurAddr is the active direct endpoint (e.g. "10.0.0.0:41641")
-            cur = peer.get('CurAddr', '')
-            if cur:
-                ip = cur.rsplit(':', 1)[0]
-                if ip:
-                    peer_ips.add(ip)
-        if not peer_ips:
-            return
-        # Resolve peer IPs → MACs via kernel neighbor cache
-        neigh = Path('/proc/net/arp').read_text()
-        found = set()
-        for line in neigh.splitlines():
-            fields = line.split()
-            if len(fields) < 4:
-                continue
-            ip, _, flags, mac = fields[0], fields[1], fields[2], fields[3]
-            if ip in peer_ips and mac != '00:00:00:00:00:00' and flags != '0x0':
-                found.add(mac.lower())
-        tailscale_peer_macs = found
-        logging.info(f"Tailscale peer MACs excluded from presence monitoring: {found}")
-    except Exception as e:
-        logging.warning(f"seed_tailscale_peers failed: {e}")
-
-
 def send_alert(msg: str) -> None:
     """Send alert to Matrix room.
 
@@ -1606,10 +1557,6 @@ def parse_frame(data: bytes) -> None:
             # ARP replies (opcode 2) may be AP ARP proxy forgeries: the AP answers
             # on behalf of disconnected clients with the client MAC as Ethernet source.
             if len(data) >= 22 and struct.unpack('!H', data[20:22])[0] == 1:
-                # Tailscale peers: OPi has a live WireGuard session to each peer's LAN
-                # endpoint. Bidirectional keepalives keep the peer MAC REACHABLE in the
-                # kernel ARP cache indefinitely — exclude to prevent false presence.
-                if src_mac not in tailscale_peer_macs:
                 _update_last_seen(src_mac)
                 # Personal devices first seen via ARP get no DHCP/Netlink event.
                 # Fire on_arrival so they get ARRIVED alert and occupancy counts.
@@ -1878,7 +1825,6 @@ def main() -> None:
     logging.info(f"Net alerter starting on interface {iface}")
 
     seed_infrastructure_ips(iface)
-    seed_tailscale_peers()
     seed_from_arp_cache()
 
     # Start monitor threads