fix(browser): host agent browser in workbench

scripts/browser-agent-host-regression.ts

@@ -0,0 +1,38 @@
+import assert from 'node:assert/strict'
+import { app, BrowserWindow } from 'electron'
+import {
+  browserHostView,
+  closeAgentBrowser,
+  createAgentBrowser,
+  publishBrowserHostOpened,
+  setBrowserBounds,
+  setBrowserHostEventSink
+} from '../src/main/browser-host'
+
+async function main(): Promise<void> {
+  await app.whenReady()
+  const owner = new BrowserWindow({ show: false, width: 1335, height: 916 })
+  const events: Array<{ type: string; id: string; sessionId?: string }> = []
+  setBrowserHostEventSink(event => events.push({ type: event.type, id: event.view.id, sessionId: event.view.sessionId }))
+
+  const sessionId = 'browser-agent-regression'
+  const agent = createAgentBrowser(owner, sessionId)
+  await agent.contents.loadURL('data:text/html,<title>Agent Browser</title><h1>ready</h1>')
+
+  assert.equal(browserHostView(owner, agent.id, sessionId).visible, false)
+  setBrowserBounds(owner, agent.id, { x: 20, y: 20, width: 800, height: 600 }, sessionId)
+  assert.equal(browserHostView(owner, agent.id, sessionId).visible, true)
+  publishBrowserHostOpened(owner, agent.id, sessionId)
+  assert.deepEqual(events, [{ type: 'opened', id: agent.id, sessionId }])
+
+  closeAgentBrowser(owner, agent.id, sessionId)
+  setBrowserHostEventSink(undefined)
+  owner.destroy()
+  console.log('Agent browser host lifecycle regression checks passed.')
+  app.quit()
+}
+
+void main().catch(error => {
+  console.error(error)
+  app.exit(1)
+})