feat: add zerotier to network cli

pkgs/clan-cli/clan_lib/network/zerotier/__init__.py

@@ -0,0 +1,41 @@
+import logging
+import time
+from collections.abc import Iterator
+from contextlib import contextmanager
+from dataclasses import dataclass
+
+from clan_lib.errors import ClanError
+from clan_lib.network import Network, NetworkTechnologyBase, Peer
+from clan_lib.ssh.remote import Remote
+
+log = logging.getLogger(__name__)
+
+
+@dataclass(frozen=True)
+class NetworkTechnology(NetworkTechnologyBase):
+    def is_running(self) -> bool:
+        return True
+
+    def ping(self, remote: Remote) -> None | float:
+        if self.is_running():
+            try:
+                # Use the existing SSH reachability check
+                now = time.time()
+                remote.check_machine_ssh_reachable()
+
+                return (time.time() - now) * 1000
+
+            except ClanError as e:
+                log.debug(f"Error checking peer {remote}: {e}")
+                return None
+        return None
+
+    @contextmanager
+    def connection(self, network: Network) -> Iterator[Network]:
+        yield network
+
+    def remote(self, peer: Peer) -> "Remote":
+        return Remote(
+            address=peer.host,
+            command_prefix=peer.name,
+        )