refactor: centralize Nix-managed Codex assets and integrations

flake.lock

@@ -286,22 +286,6 @@
         "type": "github"
       }
     },
-    "ponytail": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1788798420,
-        "narHash": "sha256-LPNMyHsri3+eeDmphEAKL1JgoRE4dLIPfZ4XZ+xu5UY=",
-        "owner": "DietrichGebert",
-        "repo": "ponytail",
-        "rev": "356918eba965ee1eac64bd3a7f0dd02108350de5",
-        "type": "github"
-      },
-      "original": {
-        "owner": "DietrichGebert",
-        "repo": "ponytail",
-        "type": "github"
-      }
-    },
     "root": {
       "inputs": {
         "disko": "disko",
@@ -314,7 +298,6 @@
         "nixos-hardware": "nixos-hardware",
         "nixpkgs": "nixpkgs",
         "noctalia": "noctalia",
-        "ponytail": "ponytail",
         "sops-nix": "sops-nix",
         "walker": "walker"
       }