add openspec CLI

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

@@ -0,0 +1,23 @@
+## Why
+
+<!-- Explain the motivation for this change. What problem does this solve? Why now? -->
+
+## What Changes
+
+<!-- Describe what will change. Be specific about new capabilities, modifications, or removals. -->
+
+## Capabilities
+
+### New Capabilities
+<!-- Capabilities being introduced. Replace <name> with kebab-case identifier (e.g., user-auth, data-export, api-rate-limiting). Each creates specs/<name>/spec.md -->
+- `<name>`: <brief description of what this capability covers>
+
+### Modified Capabilities
+<!-- Existing capabilities whose REQUIREMENTS are changing (not just implementation).
+     Only list here if spec-level behavior changes. Each needs a delta spec file.
+     Use existing spec names from openspec/specs/. Leave empty if no requirement changes. -->
+- `<existing-name>`: <what requirement is changing>
+
+## Impact
+
+<!-- Affected code, APIs, dependencies, systems -->