fix: treat reply-to-bot as implicit mention across channels

extensions/msteams/src/sent-message-cache.test.ts

@@ -0,0 +1,16 @@
+import { describe, expect, it } from "vitest";
+
+import {
+  clearMSTeamsSentMessageCache,
+  recordMSTeamsSentMessage,
+  wasMSTeamsMessageSent,
+} from "./sent-message-cache.js";
+
+describe("msteams sent message cache", () => {
+  it("records and resolves sent message ids", () => {
+    clearMSTeamsSentMessageCache();
+    recordMSTeamsSentMessage("conv-1", "msg-1");
+    expect(wasMSTeamsMessageSent("conv-1", "msg-1")).toBe(true);
+    expect(wasMSTeamsMessageSent("conv-1", "msg-2")).toBe(false);
+  });
+});