- Set `chatgpt.enable = true` for both Garand‑Desktop and Garand‑Laptop. - Rename `modules/home/codex.nix` to `modules/home/codex/default.nix`. - Add `mutableSettings = true` and import `plugins.nix` in the Codex module. - Introduce `modules/home/codex/plugins.nix` defining Codex plugins and marketplaces. - Update `modules/home/default.nix` to import the new Codex directory. - Refresh ChatGPT desktop entry icon SHA256 hash.