feat: add uConsole CM5 host configuration with Reticulum mesh stack

- New NixOS host 'uConsole' for ClockworkPi CM5 portable terminal
- flake.nix: add nixos-uconsole and nixos-raspberrypi inputs
- Imports: nixos-uconsole.nixosModules.uconsole-cm5,
  nixos-raspberrypi.nixosModules.raspberry-pi-5.base
- Full package list: base tools, HAM radio, SDR/RF, mesh/LoRa,
  security tools, GPS/maps
- Reticulum stack (rns 1.2.9, lxmf 0.9.8, nomadnet 1.1.1) built
  from PyPI via overlays/reticulum.nix
- systemd services: rnsd (Reticulum daemon), kismet (Wi-Fi IDS)
- Kernel modules for SDR (rtl-sdr, dvb) and USB WiFi
- Follows existing host config conventions (cyt-pi as template)

overlays/reticulum.nix

@@ -0,0 +1,77 @@
+final: prev: let
+  python3 = final.python3;
+  pyPkgs = python3.pkgs;
+in {
+  reticulumStack = python3.pkgs.buildPythonApplication rec {
+    pname = "reticulum";
+    version = "1.2.9";
+    src = pyPkgs.fetchPypi {
+      pname = "rns";
+      inherit version;
+      sha256 = "554814231c237b9caacf8df669312e57dd7d3f84b6d4810125087d1a79a75d75";
+    };
+    propagatedBuildInputs = with pyPkgs; [ cryptography pyserial ];
+    doCheck = false;
+    pythonImportsCheck = [ "RNS" ];
+    meta = with final.lib; {
+      description = "Self-configuring, encrypted and resilient mesh networking stack";
+      homepage = "https://reticulum.network/";
+      license = licenses.mit;
+      platforms = platforms.linux;
+    };
+  };
+
+  lxmf = python3.pkgs.buildPythonApplication rec {
+    pname = "lxmf";
+    version = "0.9.8";
+    src = pyPkgs.fetchPypi {
+      inherit pname version;
+      sha256 = "30f39f3a975a049c12ee2cfceb3261d24cb5adec881c6821f7354464b3f3650c";
+    };
+    propagatedBuildInputs = [ final.reticulumStack ];
+    doCheck = false;
+    pythonImportsCheck = [ "LXMF" ];
+    meta = with final.lib; {
+      description = "Lightweight Extensible Message Format for Reticulum";
+      homepage = "https://github.com/markqvist/lxmf";
+      license = licenses.mit;
+      platforms = platforms.linux;
+    };
+  };
+
+  nomadnet = python3.pkgs.buildPythonApplication rec {
+    pname = "nomadnet";
+    version = "1.1.1";
+    src = pyPkgs.fetchPypi {
+      inherit pname version;
+      sha256 = "fa13b64a10e75b705a58024815ab72451700aa726af96d415ba99dec28dfc40a";
+    };
+    propagatedBuildInputs = with pyPkgs; [ final.reticulumStack final.lxmf urwid qrcode ];
+    doCheck = false;
+    pythonImportsCheck = [ "nomadnet" ];
+    meta = with final.lib; {
+      description = "Nomad Network — resilient mesh communications platform";
+      homepage = "https://github.com/markqvist/NomadNet";
+      license = licenses.mit;
+      platforms = platforms.linux;
+    };
+  };
+
+  rnsh = python3.pkgs.buildPythonApplication rec {
+    pname = "rnsh";
+    version = "0.1.7";
+    src = pyPkgs.fetchPypi {
+      inherit pname version;
+      sha256 = "9cb72f25abb1c6d300f8014b264184ff78f592fe88e36094938012990b797c93";
+    };
+    propagatedBuildInputs = [ final.reticulumStack ];
+    doCheck = false;
+    pythonImportsCheck = [ "rnsh" ];
+    meta = with final.lib; {
+      description = "Remote shell over Reticulum";
+      homepage = "https://github.com/acehoss/rnsh";
+      license = licenses.mit;
+      platforms = platforms.linux;
+    };
+  };
+}