Use VS Code handoffs

templates/commands/plan.md

@@ -1,5 +1,10 @@
 ---
 description: Execute the implementation planning workflow using the plan template to generate design artifacts.
+handoffs: 
+  - label: Create Tasks
+    agent: speckit.tasks
+    prompt: Break the plan into tasks
+    send: true
 scripts:
   sh: scripts/bash/setup-plan.sh --json
   ps: scripts/powershell/setup-plan.ps1 -Json