Merge pull request #487 from DecapodLabs/agent/codex/nix-25-11-flake

nix: move flake input to 25.11

Author: alexhraber

flake.lock

@@ -3,7 +3,7 @@
 
   inputs = {
     flake-utils.url = "github:numtide/flake-utils";
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
     rust-overlay.url = "github:oxalica/rust-overlay";
   };