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>

machines/little-rascal/configuration.nix

@@ -0,0 +1,126 @@
+# Little Rascal - Development Laptop Configuration
+# Based on congenital-optimist with laptop-specific adjustments
+
+{
+  config,
+  pkgs,
+  lib,
+  inputs,
+  unstable,
+  ...
+}: {
+  imports = [
+    ./hardware-configuration.nix
+    
+    # Common modules
+    ../../modules/common/base.nix
+    ../../modules/common/nix.nix
+    ../../modules/common/tty.nix
+    ../../modules/common/emacs.nix
+    
+    # Desktop
+    ../../modules/desktop/niri.nix
+    ../../modules/desktop/fonts.nix
+    
+    # Development 
+    ../../modules/development/tools.nix
+    ../../modules/ai/claude-code.nix
+    
+    # Users
+    ../../modules/users/geir.nix
+    ../../modules/users/common.nix
+    ../../modules/users/shell-aliases.nix
+    
+    # Virtualization
+    ../../modules/virtualization/libvirt.nix
+    ../../modules/virtualization/incus.nix
+    ../../modules/virtualization/podman.nix
+    
+    # Audio
+    ../../modules/sound/pipewire.nix
+    
+    # Network
+    ../../modules/network/common.nix
+    ../../modules/network/extraHosts.nix
+    
+    # Security
+    ../../modules/security/ssh-keys.nix
+  ];
+
+  networking = {
+    hostName = "little-rascal";
+    networkmanager.enable = true;
+    
+    # Tailscale for home lab access
+    firewall = {
+      enable = true;
+      allowedUDPPorts = [ 41641 ]; # Tailscale
+      allowedTCPPorts = [ 22 ]; # SSH
+    };
+  };
+
+  # Boot configuration  
+  boot = {
+    loader = {
+      systemd-boot.enable = true;
+      efi.canTouchEfiVariables = true;
+      timeout = 3;
+    };
+    
+    kernelModules = [ "kvm-amd" "zram" ];
+    tmp.cleanOnBoot = true;
+    
+    # zram swap like other machines
+    kernel.sysctl."vm.swappiness" = 180;
+  };
+
+  # zram configuration
+  zramSwap = {
+    enable = true;
+    algorithm = "zstd";
+    memoryPercent = 25; # Use 25% of RAM for zram
+  };
+
+  # Hardware - minimal for laptop
+  hardware = {
+    bluetooth.enable = true;
+    graphics.enable = true;
+  };
+
+  # Laptop-specific services
+  services = {
+    # Power management for laptop
+    power-profiles-daemon.enable = true;
+    upower.enable = true;
+    
+    # Display manager
+    greetd = {
+      enable = true;
+      settings = {
+        default_session = {
+          command = "${pkgs.greetd.tuigreet}/bin/tuigreet --time --cmd ${pkgs.zsh}/bin/zsh";
+          user = "greeter";
+        };
+      };
+    };
+    
+    # Essential services
+    tailscale.enable = true;
+    blueman.enable = true;
+    printing.enable = true;
+    
+    # Location services for time zone
+    geoclue2.enable = true;
+  };
+
+  # Localization
+  time.timeZone = "Europe/Oslo";
+  i18n.defaultLocale = "en_US.UTF-8";
+  console = {
+    font = "Lat2-Terminus16";
+    keyMap = "no";
+  };
+
+  # System version
+  system.stateVersion = "25.05";
+}