Set up LLM and Aider.

Update flake deps.

home/packages.nix

@@ -1,22 +1,30 @@
 { pkgs }:
+let
+  corePkgs = with pkgs; [
+    direnv
+    fzf
+    git
+    mosh
+    ripgrep
+    tmux
+    zsh
+  ];
+
+  pythonEnv = pkgs.unstable.python3.withPackages (ps: [
+    ps.aider-chat
+    ps.google-generativeai
+    ps.ipython
+    ps.llm
+    ps.llm-gemini
+  ]);
+
+  fishPkgs = with pkgs.fishPlugins; [
+    pure
+    # don't add failed commands to history
+    sponge
+    transient-fish
+  ];
+in
 {
-  packages =
-    with pkgs;
-    [
-      direnv
-      fzf
-      git
-      home-manager
-      mosh
-      python312Packages.ipython
-      ripgrep
-      tmux
-      zsh
-    ]
-    ++ (with pkgs.fishPlugins; [
-      pure
-      # don't add failed commands to history
-      sponge
-      transient-fish
-    ]);
+  packages = corePkgs ++ [ pythonEnv ] ++ fishPkgs;
 }