MS Teams: refactor provider + replyStyle + reliability

src/msteams/sdk-types.ts

@@ -0,0 +1,19 @@
+import type { TurnContext } from "@microsoft/agents-hosting";
+
+/**
+ * Minimal public surface we depend on from the Microsoft SDK types.
+ *
+ * Note: we intentionally avoid coupling to SDK classes with private members
+ * (like TurnContext) in our own public signatures. The SDK's TS surface is also
+ * stricter than what the runtime accepts (e.g. it allows plain activity-like
+ * objects), so we model the minimal structural shape we rely on.
+ */
+export type MSTeamsActivity = TurnContext["activity"];
+
+export type MSTeamsTurnContext = {
+  activity: MSTeamsActivity;
+  sendActivity: (textOrActivity: string | object) => Promise<unknown>;
+  sendActivities: (
+    activities: Array<{ type: string } & Record<string, unknown>>,
+  ) => Promise<unknown>;
+};