chore(codex-cli): drop vendored npm wrapper, use nixpkgs#codex (0.133.0) (#684)

OpenAI rewrote codex in Rust mid-2025 and nixpkgs now ships it under
`codex` (currently 0.133.0). Our vendored derivation pinned npm
`@openai/codex` 0.46.0 and was carrying ~89 minor versions of drift
behind upstream — and the npm package itself has since moved to per-arch
optionalDependencies that don't fit our existing build shape.

Easier and cleaner: stop maintaining the wrapper, consume nixpkgs.

Changes:
- module.nix: `codex-cli = pkgs.codex` instead of callPackage ./.
- module.nix + codex-cli.nix: drop `codex = "codex-cli"` aliases
  (`codex` is the real binary name now); rest of the convenience
  aliases (ai-code, openai-codex, cx, code-ai) repoint to `codex`.
- module.nix: fix `CODEX_BIN` path in the codex-project helper script
  from `bin/codex-cli` to `bin/codex`.
- Delete `home/development/codex-cli/{default.nix,package-lock.json}`
  (the old npm wrapper).

Verified: razer + p620 + p510 system closures all build clean.

Author: olafkfreund

home/development/codex-cli.nix

@@ -20,13 +20,14 @@
     # API key integration (use agenix secret)
     apiKeyFile = "/run/agenix/api-openai";
 
-    # Enhanced shell aliases for convenience
+    # Enhanced shell aliases for convenience. `codex` is the real binary
+    # name from nixpkgs#codex — no need to alias it. The rest stay so
+    # existing muscle memory keeps working.
     shellAliases = {
-      codex = "codex-cli";
-      ai-code = "codex-cli";
-      openai-codex = "codex-cli";
-      cx = "codex-cli"; # Short alias
-      code-ai = "codex-cli";
+      ai-code = "codex";
+      openai-codex = "codex";
+      cx = "codex"; # Short alias
+      code-ai = "codex";
 
       # Project-specific aliases
       codex-project = "codex-project";

home/development/codex-cli/default.nix

@@ -4,7 +4,11 @@ let
   inherit (lib) mkOption mkIf mkEnableOption types;
   cfg = config.programs.codex-cli;
 
-  codex-cli = pkgs.callPackage ./. { inherit (pkgs) nodejs_24; };
+  # Use nixpkgs's `codex` package (Rust-based, upstream-maintained).
+  # We previously vendored an npm-based @openai/codex 0.46.0 derivation;
+  # OpenAI rewrote codex in Rust mid-2025 and nixpkgs tracks it, so we
+  # just consume that and stop maintaining our own packaging.
+  codex-cli = pkgs.codex;
 
   # Note: Configuration template available but using inline generation instead
   # configFile = pkgs.writeText "codex-config.json" (builtins.toJSON {
@@ -81,11 +85,12 @@ in
     shellAliases = mkOption {
       type = types.attrsOf types.str;
       default = {
-        codex = "codex-cli";
-        ai-code = "codex-cli";
-        openai-codex = "codex-cli";
+        # `codex` is the real binary name in nixpkgs#codex; keep the rest
+        # as convenience aliases so existing muscle memory still works.
+        ai-code = "codex";
+        openai-codex = "codex";
       };
-      description = "Shell aliases for codex-cli";
+      description = "Shell aliases for codex";
     };
 
     extraConfig = mkOption {
@@ -116,7 +121,7 @@ in
 
           set -euo pipefail
 
-          CODEX_BIN="${cfg.package}/bin/codex-cli"
+          CODEX_BIN="${cfg.package}/bin/codex"
           PROJECT_ROOT="$(git rev-parse --show-toplevel 2>/dev/null || pwd)"
 
           # Function to analyze project context