chore: update flake

flake.nix

@@ -3,18 +3,30 @@
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
     fenix.url = "github:nix-community/fenix";
     fenix.inputs.nixpkgs.follows = "nixpkgs";
+    llm-agents = {
+      url = "github:numtide/llm-agents.nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
     flake-compat = {
       url = "https://git.lix.systems/lix-project/flake-compat/archive/main.tar.gz";
       flake = false;
     };
   };
-  outputs = { nixpkgs, fenix, ... }:
+  outputs =
+    inputs@{ nixpkgs, fenix, ... }:
     let
       forAllSystems = nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed;
     in
     {
-      devShells = forAllSystems (system:
-        let pkgs = import nixpkgs { inherit system; config.allowUnfree = true; }; in
+      devShells = forAllSystems (
+        system:
+        let
+          pkgs = import nixpkgs {
+            inherit system;
+            config.allowUnfree = true;
+          };
+          llm-agents = inputs.llm-agents.packages.${pkgs.stdenv.hostPlatform.system};
+        in
         {
           default = pkgs.mkShell {
             packages = with pkgs; [
@@ -30,12 +42,14 @@
               cargo-bloat
               lldb
               valgrind
+              kdePackages.kcachegrind
               hyperfine
               just
               samply
               tokei
 
-              claude-code
+              llm-agents.claude-code
+              llm-agents.opencode
             ];
           };
         }