[claude] Add Important Notes about sudo access

Add an "Important Notes" section to CLAUDE.md clarifying that Claude Code does not have sudo access and that users should run elevated commands themselves (e.g., `sudo nixos-rebuild switch`).

CLAUDE.md

@@ -137,3 +137,7 @@ This script pulls from the remote git repository and applies the configuration.
 - **SSH**: OpenSSH enabled on all configurations
 - **Garbage collection**: Automatic, deletes older than 10 days
 - **Unfree packages**: Allowed globally
+
+## Important Notes
+
+- **Sudo access**: Claude Code does not have sudo access. Ask the user to run elevated commands like `sudo nixos-rebuild switch`