Refactor emacs configuration and clean up lab-tool project

- Reorganized emacs configuration with profiles in modules/development/emacs.nix
- Updated machine configurations to use new emacs module structure
- Cleaned up lab-tool project by removing archive, research, testing, and utils directories
- Streamlined lab-tool to focus on core deployment functionality with deploy-rs
- Added DEVELOPMENT.md documentation for lab-tool

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

modules/common/emacs.nix

@@ -1,20 +0,0 @@
-# Common Emacs Configuration
-# Shared Emacs setup for all machines
-{
-  config,
-  pkgs,
-  ...
-}: {
-  # System-wide Emacs installation
-  environment.systemPackages = with pkgs; [
-    emacs
-    # Basic Emacs utilities
-    emacsPackages.use-package
-  ];
-
-  # Set Emacs as default editor
-  environment.sessionVariables = {
-    EDITOR = "emacs";
-    VISUAL = "emacs";
-  };
-}