flake.lock: Update

Flake lock file updates:

• Updated input 'llm-agents':
    'github:numtide/llm-agents.nix/03aa73a454d7468e0a3d44faee511fa6ae7c7ded?narHash=sha256-DjGLaiqnHlHQ9d8EfKhklMlCRoEC97FkI9XRgznopL8%3D' (2026-09-26)
  → 'github:numtide/llm-agents.nix/af40d966859ec4075ecc172dbb39e53f474dc5d9?narHash=sha256-I4O5GSbZgmvzV7dj8fZN8furV2UdEpahh4rvsZOfs/Q%3D' (2026-09-30)
• Updated input 'llm-agents/nixpkgs':
    'github:NixOS/nixpkgs/d54020a6ac3211e9f4201631bdf67678818c0cdf?narHash=sha256-StRyS/lFHtIw/UgJk%2Bxo%2BHA66mtoWeDUbkJdvf2Byn4%3D' (2026-09-26)
  → 'github:NixOS/nixpkgs/f45c6f04c2f013f004bf94e284e95d72898d9393?narHash=sha256-6k3n7X2UsZ6tAlWTz99RimiZab%2B17tMUrw9sRUcELiA%3D' (2026-09-28)

flake.lock

@@ -451,11 +451,11 @@
         "treefmt-nix": "treefmt-nix"
       },
       "locked": {
-        "lastModified": 1790416022,
-        "narHash": "sha256-DjGLaiqnHlHQ9d8EfKhklMlCRoEC97FkI9XRgznopL8=",
+        "lastModified": 1790746077,
+        "narHash": "sha256-I4O5GSbZgmvzV7dj8fZN8furV2UdEpahh4rvsZOfs/Q=",
         "owner": "numtide",
         "repo": "llm-agents.nix",
-        "rev": "03aa73a454d7468e0a3d44faee511fa6ae7c7ded",
+        "rev": "af40d966859ec4075ecc172dbb39e53f474dc5d9",
         "type": "github"
       },
       "original": {
@@ -607,11 +607,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1790390834,
-        "narHash": "sha256-StRyS/lFHtIw/UgJk+xo+HA66mtoWeDUbkJdvf2Byn4=",
+        "lastModified": 1790600678,
+        "narHash": "sha256-6k3n7X2UsZ6tAlWTz99RimiZab+17tMUrw9sRUcELiA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d54020a6ac3211e9f4201631bdf67678818c0cdf",
+        "rev": "f45c6f04c2f013f004bf94e284e95d72898d9393",
         "type": "github"
       },
       "original": {