test(telegram): cover caption and forum service helpers

extensions/telegram/src/caption.test.ts

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+import { describe, expect, it } from "vitest";
+import { splitTelegramCaption, TELEGRAM_MAX_CAPTION_LENGTH } from "./caption.js";
+
+describe("splitTelegramCaption", () => {
+  it("returns empty parts for blank captions", () => {
+    expect(splitTelegramCaption("   ")).toEqual({
+      caption: undefined,
+      followUpText: undefined,
+    });
+  });
+
+  it("keeps short captions inline", () => {
+    expect(splitTelegramCaption(" hello ")).toEqual({
+      caption: "hello",
+      followUpText: undefined,
+    });
+  });
+
+  it("moves oversized captions into follow-up text", () => {
+    const text = "x".repeat(TELEGRAM_MAX_CAPTION_LENGTH + 1);
+    expect(splitTelegramCaption(text)).toEqual({
+      caption: undefined,
+      followUpText: text,
+    });
+  });
+});

extensions/telegram/src/forum-service-message.test.ts

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+import { describe, expect, it } from "vitest";
+import {
+  isTelegramForumServiceMessage,
+  TELEGRAM_FORUM_SERVICE_FIELDS,
+} from "./forum-service-message.js";
+
+describe("isTelegramForumServiceMessage", () => {
+  it("returns true for any Telegram forum service field", () => {
+    for (const field of TELEGRAM_FORUM_SERVICE_FIELDS) {
+      expect(isTelegramForumServiceMessage({ [field]: {} })).toBe(true);
+    }
+  });
+
+  it("returns false for normal messages and non-objects", () => {
+    expect(isTelegramForumServiceMessage({ text: "hello" })).toBe(false);
+    expect(isTelegramForumServiceMessage(null)).toBe(false);
+    expect(isTelegramForumServiceMessage("topic created")).toBe(false);
+  });
+});