feat: Add little-rascal laptop config and lab-tool auto-update system

## New Machine: little-rascal
- Add Lenovo Yoga Slim 7 14ARE05 configuration (AMD Ryzen 7 4700U)
- Niri desktop with CLI login (greetd + tuigreet)
- zram swap configuration (25% of RAM with zstd)
- AMD-optimized hardware support and power management
- Based on congenital-optimist structure with laptop-specific additions

## Lab Tool Auto-Update System
- Implement Guile Scheme auto-update module (lab/auto-update.scm)
- Add health checks, logging, and safety features
- Integrate with existing deployment and machine management
- Update main CLI with auto-update and auto-update-status commands
- Create NixOS service module for automated updates
- Document complete implementation in simple-auto-update-plan.md

## MCP Integration
- Configure Task Master AI and Context7 MCP servers
- Set up local Ollama integration for AI processing
- Add proper environment configuration for existing models

## Infrastructure Updates
- Add little-rascal to flake.nix with deploy-rs support
- Fix common user configuration issues
- Create missing emacs.nix module
- Update package integrations

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

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

modules/services/lab-auto-update-example.nix

@@ -0,0 +1,44 @@
+# Example configuration for enabling lab auto-update service
+# Add this to your machine's configuration.nix
+
+{
+  # Import the lab auto-update service module
+  imports = [
+    ../services/lab-auto-update.nix
+  ];
+
+  # Enable and configure the auto-update service
+  services.lab-auto-update = {
+    enable = true;
+    
+    # Schedule updates at 2:00 AM with up to 30 minute random delay
+    schedule = "02:00";
+    randomizedDelay = "30m";
+    
+    # Path to your home lab flake
+    flakePath = "/home/geir/Projects/home-lab";
+    
+    # Keep logs for 30 days
+    logRetentionDays = 30;
+    
+    # Persist timer across reboots
+    persistent = true;
+  };
+  
+  # Optional: Enable the lab tool package system-wide
+  environment.systemPackages = with pkgs; [
+    (pkgs.callPackage ../../packages/lab-tools.nix {}).default
+  ];
+  
+  # Optional: Staggered scheduling for different machine types
+  # Uncomment and modify based on machine role:
+  
+  # For database/storage servers (run first)
+  # services.lab-auto-update.schedule = "02:00";
+  
+  # For application servers (run after storage)
+  # services.lab-auto-update.schedule = "02:30";
+  
+  # For development machines (run last)
+  # services.lab-auto-update.schedule = "03:00";
+}