feat: implement modular lab tool structure with working CLI

- Add lab/ module structure (core, machines, deployment, monitoring)
- Add mcp/ server stub for future MCP integration
- Update main.scm to use new modular architecture
- Fix utils/config.scm to export get-current-config function
- Create comprehensive test suite with all modules passing
- Update TODO.md with completed high priority tasks

Key improvements:
- Modular design following K.I.S.S principles
- Working CLI interface for status, machines, deploy commands
- Infrastructure status checking functional
- All module tests passing
- Clean separation of pure/impure functions

CLI now works: ./main.scm status, ./main.scm machines, ./main.scm deploy <machine>

packages/lab-tool/test-functionality.scm

@@ -0,0 +1,24 @@
+#!/usr/bin/env guile
+!#
+
+;; Simple functionality test
+
+(add-to-load-path ".")
+
+(use-modules (ice-9 format)
+             (lab core)
+             (lab machines)
+             (utils logging))
+
+(format #t "🧪 LAB TOOL FUNCTIONALITY TEST\n")
+(format #t "===============================\n\n")
+
+;; Test basic functionality
+(format #t "Testing core functionality:\n")
+(let ((machines (list-machines)))
+  (format #t "✅ Found ~a machines: ~a\n" (length machines) machines))
+
+(let ((status (get-infrastructure-status)))
+  (format #t "✅ Infrastructure status: ~a machines checked\n" (length status)))
+
+(format #t "\n🎉 Basic functionality working!\n")