feat(telegram): add silent message option (#2382)

* feat(telegram): add silent message option (disable_notification)

Add support for sending Telegram messages silently without notification
sound via the `silent` parameter on the message tool.

Changes:
- Add `silent` boolean to message tool schema
- Extract and pass `silent` through telegram plugin
- Add `disable_notification: true` to Telegram API calls
- Add `--silent` flag to CLI `message send` command
- Add unit test for silent flag

Closes #2249

AI-assisted (Claude) - fully tested with unit tests + manual Telegram testing

* feat(telegram): add silent send option (#2382) (thanks @Suksham-sharma)

---------

Co-authored-by: Pocket Clawd <pocket@Pockets-Mac-mini.local>

src/telegram/send.returns-undefined-empty-input.test.ts

@@ -476,6 +476,28 @@ describe("sendMessageTelegram", () => {
     });
   });
 
+  it("sets disable_notification when silent is true", async () => {
+    const chatId = "123";
+    const sendMessage = vi.fn().mockResolvedValue({
+      message_id: 1,
+      chat: { id: chatId },
+    });
+    const api = { sendMessage } as unknown as {
+      sendMessage: typeof sendMessage;
+    };
+
+    await sendMessageTelegram(chatId, "hi", {
+      token: "tok",
+      api,
+      silent: true,
+    });
+
+    expect(sendMessage).toHaveBeenCalledWith(chatId, "hi", {
+      parse_mode: "HTML",
+      disable_notification: true,
+    });
+  });
+
   it("parses message_thread_id from recipient string (telegram:group:...:topic:...)", async () => {
     const chatId = "-1001234567890";
     const sendMessage = vi.fn().mockResolvedValue({