AGENTS.md: add hierarchical documentation for hosts, home, features, services

home/AGENTS.md

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+# home/ - Home Manager Configurations
+
+User-level configurations managed by home-manager.
+
+## Structure
+
+```
+home/
+├── common/         # Shared home-manager config
+│   └── default.nix   # Overlays, nix-colors, allowUnfree
+├── features/       # Modular, toggle-able features
+│   ├── cli/          # Shell tools (see features/AGENTS.md)
+│   ├── coding/       # Dev tools
+│   └── desktop/      # GUI, Hyprland, theming
+└── m3tam3re/       # Per-host user configs
+    ├── home.nix      # Shared user config (git, ssh, packages)
+    └── m3-<host>.nix # Host-specific (imports features, monitor layouts)
+```
+
+## Per-Host Config Pattern
+
+Each `m3-<host>.nix`:
+1. Imports `../common`, `./home.nix`, and needed `../features/*`
+2. Enables specific features via `features.<category>.<name>.enable`
+3. Overrides host-specific settings (monitors, default apps)
+
+Example:
+```nix
+{
+  imports = [../common ./home.nix ../features/cli ../features/desktop];
+  
+  features.cli.nushell.enable = true;
+  features.desktop.hyprland.enable = true;
+  
+  wayland.windowManager.hyprland.settings.monitor = ["DP-1,2560x1440,0x0,1"];
+}
+```
+
+## Theming
+
+Uses nix-colors (Dracula scheme). Access colors:
+```nix
+"#${config.colorScheme.palette.base00}"  # Background
+"#${config.colorScheme.palette.base05}"  # Foreground
+```
+
+## Adding New User Config
+
+1. Create `m3tam3re/m3-<newhost>.nix`
+2. Import needed features
+3. Add to `flake.nix` homeConfigurations (standalone) or host's home-manager.users