Add rofi launcher for tmux Codex and nixos agent notes

nixos/AGENTS.md

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+# Agent Notes (dotfiles/nixos)
+
+This repository is a single git repo rooted at `~/dotfiles`. This `nixos/` directory is the NixOS flake, but most "user command" scripts and shell functions live outside of it.
+
+## Where To Put Things
+
+- Shell functions (autoloaded by zsh): `../dotfiles/lib/functions/`
+  - These are added to `fpath` in `nixos/environment.nix`, then autoloaded.
+- User-executable scripts on PATH: `../dotfiles/lib/bin/`
+  - This directory is added to PATH in `nixos/environment.nix` via `${libDir}/bin`.
+
+Avoid dropping scripts in `~/bin` or `~/.local/bin` unless the user explicitly asks.
+
+## NixOS Rebuild Workflow
+
+- Run `just switch` from `~/dotfiles/nixos` (not `nixos-rebuild` directly).
+- Host configs live under `machines/`.
+
+## Rofi/Tmux Integration Pointers
+
+- Existing rofi scripts live in `../dotfiles/lib/bin/` (e.g. `rofi_command.sh`).
+- Keybind locations:
+  - Hyprland: `../dotfiles/config/hypr/hyprland.conf`
+  - XMonad: `../dotfiles/config/xmonad/xmonad.hs`
+