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/lab/core.scm

@@ -0,0 +1,18 @@
+;; lab/core.scm - Core infrastructure operations (impure)
+
+(define-module (lab core)
+  #:use-module (utils config)
+  #:use-module (utils ssh)
+  #:use-module (utils logging)
+  #:export (get-infrastructure-status))
+
+;; Impure function: Get infrastructure status with side effects
+(define (get-infrastructure-status)
+  "Get status of all machines (impure - has logging side effects)"
+  (log-info "Checking infrastructure status...")
+  (let ((machines (get-all-machines)))
+    (map (lambda (machine)
+           (let ((status (test-ssh-connection machine)))
+             `((machine . ,machine)
+               (status . ,(if status 'online 'offline)))))
+         machines)))