fix(mcp): isolate optional observation adapter failures (#838)

src/composition/browserObservation.ts

@@ -0,0 +1,6 @@
+import type { BrowserObservationPort } from "../application/BrowserObservationPort.js";
+import { CdpBrowserProvider } from "../browser/CdpBrowserProvider.js";
+
+/** Construct a fresh provider without opening a target or acquiring an engine. */
+export const createBrowserObservationProvider = (): BrowserObservationPort =>
+  new CdpBrowserProvider();