feat(cli): integrate conductor as a built-in extension

- Introduce support for bundled 'builtin' extensions in ExtensionManager
- Migrate conductor extension to packages/core/src/extensions/builtin/conductor
- Add automatic migration logic to cleanup manual conductor installations
- Make extension versioning optional for built-ins, defaulting to CLI version
- Update build and bundle scripts to include builtin extensions
- Enhance documentation to highlight conductor as a core feature

scripts/copy_bundle_assets.js

@@ -73,6 +73,17 @@ if (existsSync(builtinSkillsSrc)) {
   console.log('Copied built-in skills to bundle/builtin/');
 }
 
+// 4.1 Copy Built-in Extensions (packages/core/src/extensions/builtin)
+const builtinExtensionsSrc = join(root, 'packages/core/src/extensions/builtin');
+const builtinExtensionsDest = join(bundleDir, 'extensions', 'builtin');
+if (existsSync(builtinExtensionsSrc)) {
+  cpSync(builtinExtensionsSrc, builtinExtensionsDest, {
+    recursive: true,
+    dereference: true,
+  });
+  console.log('Copied built-in extensions to bundle/extensions/builtin/');
+}
+
 // 5. Copy DevTools package so the external dynamic import resolves at runtime
 const devtoolsSrc = join(root, 'packages/devtools');
 const devtoolsDest = join(

scripts/copy_files.js

@@ -74,13 +74,21 @@ if (packageName === 'cli') {
   }
 }
 
-// Copy built-in skills for the core package.
+// Copy built-in skills and extensions for the core package.
 if (packageName === 'core') {
   const builtinSkillsSource = path.join(sourceDir, 'skills', 'builtin');
   const builtinSkillsTarget = path.join(targetDir, 'skills', 'builtin');
   if (fs.existsSync(builtinSkillsSource)) {
     fs.cpSync(builtinSkillsSource, builtinSkillsTarget, { recursive: true });
   }
+
+  const builtinExtensionsSource = path.join(sourceDir, 'extensions', 'builtin');
+  const builtinExtensionsTarget = path.join(targetDir, 'extensions', 'builtin');
+  if (fs.existsSync(builtinExtensionsSource)) {
+    fs.cpSync(builtinExtensionsSource, builtinExtensionsTarget, {
+      recursive: true,
+    });
+  }
 }
 
 console.log('Successfully copied files.');