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

src/composition/javascriptRuntimeObservation.ts

@@ -0,0 +1,6 @@
+import type { JavaScriptRuntimeObservationPort } from "../application/JavaScriptRuntimeObservationPort.js";
+import { V8InspectorProvider } from "../browser/V8InspectorProvider.js";
+
+/** Construct a fresh provider without opening a target or acquiring an engine. */
+export const createJavaScriptRuntimeObservationProvider =
+  (): JavaScriptRuntimeObservationPort => new V8InspectorProvider();