feat(foreign-port): add WiFi-only laptop as clan machine ✨

Mirrors the distant-shore pattern: clan-managed (no standalone
flake-module), wired into zerotier/data-mesher/dm-pull-deploy with the
generated vars. WiFi via NetworkManager (PSK from /etc/secrets/nm.env);
locally-signed boot chain (shim chain-loads sbsign-signed systemd-boot
+ kernel, refreshed every nixos-rebuild). targetHost is the LAN IP for
the first push, switch to ZT IPv6 once on the mesh. buildHost =
sunken-ship to avoid self-SSH on the closure copy.

vars/per-machine/foreign-port/dm-pull-deploy-status-key/signing.key/users/danny

@@ -0,0 +1 @@
+../../../../../../sops/users/danny