add openspec CLI

extensions/openspec/schemas/spec-driven/templates/design.md

@@ -0,0 +1,19 @@
+## Context
+
+<!-- Background and current state -->
+
+## Goals / Non-Goals
+
+**Goals:**
+<!-- What this design aims to achieve -->
+
+**Non-Goals:**
+<!-- What is explicitly out of scope -->
+
+## Decisions
+
+<!-- Key design decisions and rationale -->
+
+## Risks / Trade-offs
+
+<!-- Known risks and trade-offs -->