refactor!: rename chat providers to channels

src/utils/message-channel.test.ts

@@ -0,0 +1,13 @@
+import { describe, expect, it } from "vitest";
+
+import { resolveGatewayMessageChannel } from "./message-channel.js";
+
+describe("message-channel", () => {
+  it("normalizes gateway message channels and rejects unknown values", () => {
+    expect(resolveGatewayMessageChannel("discord")).toBe("discord");
+    expect(resolveGatewayMessageChannel(" imsg ")).toBe("imessage");
+    expect(resolveGatewayMessageChannel("teams")).toBe("msteams");
+    expect(resolveGatewayMessageChannel("web")).toBeUndefined();
+    expect(resolveGatewayMessageChannel("nope")).toBeUndefined();
+  });
+});