feat(extension): auto-close automation window after command completes

- Add 'close-window' action to extension protocol and background.ts
- Add Page.closeWindow() method to send close-window command
- browserSession() now closes automation window in cleanup
- Remove domain pre-navigation + 2s wait from main.ts (CDP handles
  cross-domain cookies natively, no same-origin workaround needed)
- Net effect: commands run faster, no stale windows left behind

src/browser/daemon-client.ts

@@ -15,7 +15,7 @@ function generateId(): string {
 
 export interface DaemonCommand {
   id: string;
-  action: 'exec' | 'navigate' | 'tabs' | 'cookies' | 'screenshot';
+  action: 'exec' | 'navigate' | 'tabs' | 'cookies' | 'screenshot' | 'close-window';
   tabId?: number;
   code?: string;
   url?: string;

src/browser/page.ts

@@ -37,6 +37,15 @@ export class Page implements IPage {
     }
   }
 
+  /** Close the automation window in the extension */
+  async closeWindow(): Promise<void> {
+    try {
+      await sendCommand('close-window', {});
+    } catch {
+      // Window may already be closed or daemon may be down
+    }
+  }
+
   async evaluate(js: string): Promise<any> {
     const code = wrapForEval(js);
     return sendCommand('exec', { code, ...this._tabOpt() });

src/main.ts

@@ -193,12 +193,6 @@ for (const [, cmd] of registry) {
       let result: any;
       if (cmd.browser) {
         result = await browserSession(BrowserBridge, async (page) => {
-          // Cookie/header strategies require same-origin context for credentialed fetch.
-          // In CDP mode the active tab may be on an unrelated domain, causing CORS failures.
-          // Navigate to the command's domain first (mirrors cascade command behavior).
-          if ((cmd.strategy === Strategy.COOKIE || cmd.strategy === Strategy.HEADER) && cmd.domain) {
-            try { await page.goto(`https://${cmd.domain}`); await page.wait(2); } catch {}
-          }
           return runWithTimeout(executeCommand(cmd, page, kwargs, actionOpts.verbose), { timeout: cmd.timeoutSeconds ?? DEFAULT_BROWSER_COMMAND_TIMEOUT, label: fullName(cmd) });
         });
       } else { result = await executeCommand(cmd, null, kwargs, actionOpts.verbose); }

src/runtime.ts

@@ -1,8 +1,5 @@
-/**
- * Runtime utilities: timeouts and browser session management.
- */
-
 import type { IPage } from './types.js';
+import type { Page } from './browser/page.js';
 
 export const DEFAULT_BROWSER_CONNECT_TIMEOUT = parseInt(process.env.OPENCLI_BROWSER_CONNECT_TIMEOUT ?? '30', 10);
 export const DEFAULT_BROWSER_COMMAND_TIMEOUT = parseInt(process.env.OPENCLI_BROWSER_COMMAND_TIMEOUT ?? '60', 10);
@@ -45,7 +42,12 @@ export async function browserSession<T>(
   const mcp = new BrowserFactory();
   try {
     const page = await mcp.connect({ timeout: DEFAULT_BROWSER_CONNECT_TIMEOUT });
-    return await fn(page);
+    const result = await fn(page);
+    // Close the automation window after command completes
+    if (typeof (page as Page).closeWindow === 'function') {
+      await (page as Page).closeWindow();
+    }
+    return result;
   } finally {
     await mcp.close().catch(() => {});
   }