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>

.mcp.json

@@ -0,0 +1,25 @@
+{
+  "mcpServers": {
+    "task-master-ai": {
+      "command": "npx",
+      "args": ["-y", "--package=task-master-ai", "task-master-ai"],
+      "env": {
+        "OLLAMA_BASE_URL": "http://grey-area:11434",
+        "OPENAI_BASE_URL": "http://grey-area:11434/v1",
+        "OLLAMA_API_KEY": "ollama",
+        "ANTHROPIC_API_KEY": "",
+        "PERPLEXITY_API_KEY": "",
+        "OPENAI_API_KEY": "",
+        "GOOGLE_API_KEY": "",
+        "XAI_API_KEY": "",
+        "OPENROUTER_API_KEY": "",
+        "MISTRAL_API_KEY": "",
+        "AZURE_OPENAI_API_KEY": ""
+      }
+    },
+    "context7": {
+      "command": "npx",
+      "args": ["-y", "@upstash/context7-mcp"]
+    }
+  }
+}