test(extensions): move channel contracts out of core

extensions/imessage/src/probe.contract.test.ts

@@ -0,0 +1,9 @@
+import type { BaseProbeResult } from "openclaw/plugin-sdk/channel-contract";
+import { describe, expectTypeOf, it } from "vitest";
+import type { IMessageProbe } from "./probe.js";
+
+describe("iMessage probe contract", () => {
+  it("keeps public probe aligned with base contract", () => {
+    expectTypeOf<IMessageProbe>().toMatchTypeOf<BaseProbeResult>();
+  });
+});