feat(telegram): add deleteMessage action

Add ability to delete messages in Telegram chats via the message tool.

Changes:
- Add deleteMessageTelegram function in send.ts
- Add deleteMessage action handler in telegram-actions.ts
- Add delete action support in telegram message plugin adapter
- Add deleteMessage to TelegramActionConfig type
- Update message tool description to mention delete action

Usage:
- Via message tool: action="delete", chatId, messageId
- Can be disabled via channels.telegram.actions.deleteMessage=false

Limitations (Telegram API):
- Bot can delete its own messages in any chat
- Bot can delete others' messages only if admin with "Delete Messages"
- Messages older than 48h in groups may fail to delete

src/agents/tools/telegram-actions.ts

@@ -1,7 +1,11 @@
 import type { AgentToolResult } from "@mariozechner/pi-agent-core";
 import { resolveChannelCapabilities } from "../../config/channel-capabilities.js";
 import type { ClawdbotConfig } from "../../config/config.js";
-import { reactMessageTelegram, sendMessageTelegram } from "../../telegram/send.js";
+import {
+  deleteMessageTelegram,
+  reactMessageTelegram,
+  sendMessageTelegram,
+} from "../../telegram/send.js";
 import { resolveTelegramToken } from "../../telegram/token.js";
 import {
   createActionGate,
@@ -149,5 +153,29 @@ export async function handleTelegramAction(
     });
   }
 
+  if (action === "deleteMessage") {
+    if (!isActionEnabled("deleteMessage")) {
+      throw new Error("Telegram deleteMessage is disabled.");
+    }
+    const chatId = readStringOrNumberParam(params, "chatId", {
+      required: true,
+    });
+    const messageId = readNumberParam(params, "messageId", {
+      required: true,
+      integer: true,
+    });
+    const token = resolveTelegramToken(cfg, { accountId }).token;
+    if (!token) {
+      throw new Error(
+        "Telegram bot token missing. Set TELEGRAM_BOT_TOKEN or channels.telegram.botToken.",
+      );
+    }
+    await deleteMessageTelegram(chatId ?? "", messageId ?? 0, {
+      token,
+      accountId: accountId ?? undefined,
+    });
+    return jsonResult({ ok: true, deleted: true });
+  }
+
   throw new Error(`Unsupported Telegram action: ${action}`);
 }