flake: extract devShell.nix and drop flake-compat shell.nix

devShell.nix

@@ -0,0 +1,24 @@
+{ pkgs }:
+pkgs.mkShell {
+  packages = with pkgs; [
+    (fenix.latest.withComponents [
+      "cargo"
+      "clippy"
+      "rust-src"
+      "rustc"
+      "rustfmt"
+      "rust-analyzer"
+    ])
+    cargo-machete
+    cargo-bloat
+    cargo-expand
+    lldb
+    valgrind
+    kdePackages.kcachegrind
+    hyperfine
+    just
+    samply
+    tokei
+    tombi
+  ];
+}

flake.lock

@@ -1,38 +1,5 @@
 {
   "nodes": {
-    "bun2nix": {
-      "inputs": {
-        "flake-parts": [
-          "llm-agents",
-          "flake-parts"
-        ],
-        "nixpkgs": [
-          "llm-agents",
-          "nixpkgs"
-        ],
-        "systems": [
-          "llm-agents",
-          "systems"
-        ],
-        "treefmt-nix": [
-          "llm-agents",
-          "treefmt-nix"
-        ]
-      },
-      "locked": {
-        "lastModified": 1782772816,
-        "narHash": "sha256-s9BuFv0mRuZx9C1MF8qPHRdcAK14ONi0A5m6E2wqOoM=",
-        "owner": "nix-community",
-        "repo": "bun2nix",
-        "rev": "5a39d717029e94163ac223aee8d5c9946cafed1c",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "bun2nix",
-        "type": "github"
-      }
-    },
     "fenix": {
       "inputs": {
         "nixpkgs": [
@@ -68,51 +35,6 @@
         "url": "https://git.lix.systems/lix-project/flake-compat/archive/main.tar.gz"
       }
     },
-    "flake-parts": {
-      "inputs": {
-        "nixpkgs-lib": [
-          "llm-agents",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1782949081,
-        "narHash": "sha256-vp6Y/Grm98ESt6ceOkWiHWyZRDV3J1RID4w+6NWK9yA=",
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "rev": "17c9d6cdfc60c64f4ee8d306f9bc0b4ccb51481e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "type": "github"
-      }
-    },
-    "llm-agents": {
-      "inputs": {
-        "bun2nix": "bun2nix",
-        "flake-parts": "flake-parts",
-        "nixpkgs": [
-          "nixpkgs"
-        ],
-        "systems": "systems",
-        "treefmt-nix": "treefmt-nix"
-      },
-      "locked": {
-        "lastModified": 1784096685,
-        "narHash": "sha256-b32HyAoqQdgQstUBblZ5Nnk5M62yiOhpgpJVJohJ+k0=",
-        "owner": "numtide",
-        "repo": "llm-agents.nix",
-        "rev": "d9654e7480b8146fddd709dbe5d12668bb34fa74",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "llm-agents.nix",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1784007870,
@@ -133,7 +55,6 @@
       "inputs": {
         "fenix": "fenix",
         "flake-compat": "flake-compat",
-        "llm-agents": "llm-agents",
         "nixpkgs": "nixpkgs"
       }
     },
@@ -153,42 +74,6 @@
         "repo": "rust-analyzer",
         "type": "github"
       }
-    },
-    "systems": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
-    },
-    "treefmt-nix": {
-      "inputs": {
-        "nixpkgs": [
-          "llm-agents",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1780220602,
-        "narHash": "sha256-eynAfOmbmxJnkp7YewvCEbShNnnYJ9gLLqkzsYtBPeM=",
-        "owner": "numtide",
-        "repo": "treefmt-nix",
-        "rev": "db947814a175b7ca6ded66e21383d938df01c227",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "treefmt-nix",
-        "type": "github"
-      }
     }
   },
   "root": "root",

flake.nix

@@ -3,17 +3,13 @@
     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 =
-    inputs@{ nixpkgs, fenix, ... }:
+    { nixpkgs, fenix, ... }:
     let
       forAllSystems = nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed;
     in
@@ -24,37 +20,11 @@
           pkgs = import nixpkgs {
             inherit system;
             config.allowUnfree = true;
+            overlays = [ fenix.overlays.default ];
           };
-          llm-agents = inputs.llm-agents.packages.${pkgs.stdenv.hostPlatform.system};
         in
         {
-          default = pkgs.mkShell {
+          default = import ./devShell.nix { inherit pkgs; };
-            packages = with pkgs; [
-              (fenix.packages.${system}.latest.withComponents [
-                "cargo"
-                "clippy"
-                "rust-src"
-                "rustc"
-                "rustfmt"
-                "rust-analyzer"
-              ])
-              cargo-machete
-              cargo-bloat
-              lldb
-              valgrind
-              kdePackages.kcachegrind
-              hyperfine
-              just
-              samply
-              tokei
-              tombi
-
-              # llm-agents.codex
-              llm-agents.claude-code
-              llm-agents.opencode
-              # llm-agents.forge
-            ];
-          };
         }
       );
     };

shell.nix

@@ -1,16 +0,0 @@
-let
-  lockFile = builtins.fromJSON (builtins.readFile ./flake.lock);
-  flake-compat-node = lockFile.nodes.${lockFile.nodes.root.inputs.flake-compat};
-  flake-compat = builtins.fetchTarball {
-    inherit (flake-compat-node.locked) url;
-    sha256 = flake-compat-node.locked.narHash;
-  };
-
-  flake = (
-    import flake-compat {
-      src = ./.;
-      copySourceTreeToStore = false;
-    }
-  );
-in
-  flake.shellNix