Fix stale documentation in CLAUDE.md

- Remove deleted fonts.nix from directory layout
- Update 'Adding a New Program' section to reflect ponytail cleanup: simple packages go in common.nix, per-file only for programs needing real configuration
- Update Rules section to document common.nix and per-file program patterns

CLAUDE.md

@@ -9,8 +9,7 @@ hosts/
   nikita-nixos/                  # nikita's machine
 home/
   packages-base.nix              # universal packages every host gets (neovim, ripgrep, etc.)
-  programs/                      # one file per installable program
+  programs/                      # installable programs (common.nix for simple packages, per-file for configured programs)
-  fonts.nix                      # font config
   rofi.nix                       # rofi config + packages
   symlinks.nix                   # home-manager symlinks
   tmux.nix                       # tmux config
@@ -21,26 +20,29 @@ system/                          # NixOS system-level modules
 
 ## Adding a New Program
 
-1. Create `home/programs/<name>.nix`:
+**For simple packages (no config):** Add the package to `home/programs/common.nix`'s `home.packages` list.
+
+**For programs that need configuration** (session variables, extra options, dependencies): Create `home/programs/<name>.nix`:
 
 ```nix
 { pkgs, ... }:
 {
-  home.packages = [ pkgs.<package-name> ];
+  # configuration + packages
 }
 ```
 
-The filename is the program name; the package attribute can differ (e.g. `godot.nix` uses `pkgs.godot_4`).
+Then add the import to `hosts/<host>/home.nix`:
-
-2. Add the import to whichever hosts should have it in `hosts/<host>/home.nix`:
 
 ```nix
 ../../home/programs/<name>.nix
 ```
 
+Example: `rustup.nix` needs config (session variables) so it gets its own file. Simple packages like `lazygit` go in `common.nix`.
+
 ## Rules
 
 - `home/packages-base.nix` — shared baseline, imported by every host. Only add truly universal tools here (shell utilities, editors).
-- `home/programs/` — one file per program. Hosts opt in by importing.
+- `home/programs/common.nix` — simple packages that just need to be installed (no extra config).
+- `home/programs/<name>.nix` — programs that need real configuration beyond just `home.packages`. Hosts opt in by importing.
 - `home/<tool>.nix` (tmux, zsh, rofi, etc.) — for programs that need configuration beyond just installing a package. Same opt-in pattern via host imports.
 - `system/` modules are NixOS system-level config (not home-manager). Add them to `hosts/<host>/default.nix`.