fix: use nixpkgs-uconsole (89dbf01) for uConsole host

- Matches nixos-uconsole module's expected nixpkgs version
- Other hosts (lazyworkhorse, cyt-pi) stay on nixos-unstable
- Enables full nixos-uconsole module support

flake.nix

@@ -12,15 +12,18 @@
       url = "git+https://git.lix.systems/lix-project/lix?ref=main";
       inputs.nixpkgs.follows = "nixpkgs";
     };
-    # uConsole CM5 hardware support
-    nixos-uconsole.url = "github:nixos-uconsole/nixos-uconsole";
-    # Note: nixos-uconsole manages its own nixpkgs input internally
+    # uConsole CM5 hardware support (uses its own nixpkgs for module compatibility)
+    nixpkgs-uconsole.url = "github:nixos/nixpkgs/89dbf01";  # Matches nixos-uconsole's nixpkgs (2025-12-29)
+    nixos-uconsole = {
+      url = "github:nixos-uconsole/nixos-uconsole";
+      inputs.nixpkgs.follows = "nixpkgs-uconsole";
+    };
     # Raspberry Pi 5 hardware support
     nixos-hardware.url = "github:nixos/nixos-hardware/master";
     self.submodules = true;
   };
 
-  outputs = { self, nixpkgs, agenix, lix, nixos-uconsole, nixos-hardware, ... }@inputs:
+  outputs = { self, nixpkgs, nixpkgs-uconsole, agenix, lix, nixos-uconsole, nixos-hardware, ... }@inputs:
     let
       system = "x86_64-linux";
       keys = import ./lib/keys.nix;
@@ -85,7 +88,7 @@
             ];
           };
 
-          uConsole = nixos-uconsole.lib.nixosSystem {
+          uConsole = nixpkgs-uconsole.lib.nixosSystem {
             system = "aarch64-linux";
             specialArgs = { inherit self keys paths inputs; };
             modules = [