feat: initial VS Code extension for OpenClaude

Introduce OpenClaude as a first-class VS Code extension with:

- Built-in Control Center sidebar for seamless workflow integration
- Terminal-first design with authentic monospace UI and ASCII styling
- Quick-launch buttons for OpenClaude terminal, repository access, and command palette
- Status display showing runtime and OpenAI shim configuration
- Dark theme optimized for focus and extended development sessions
- Proper extension manifest with activation events and contribution points
- Debug configuration for local development

This extension provides developers with direct access to OpenClaude
without leaving VS Code, enabling a tighter integration with the editor.

vscode-extension/openclaude-vscode/.vscode/launch.json

@@ -0,0 +1,13 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Extension",
+      "type": "extensionHost",
+      "request": "launch",
+      "args": ["--extensionDevelopmentPath=${workspaceFolder}"],
+      "outFiles": ["${workspaceFolder}/out/**/*.js"],
+      "preLaunchTask": "${defaultBuildTask}"
+    }
+  ]
+}