fix(routing): harden originating reply routing

src/telegram/send.ts

@@ -10,6 +10,7 @@ type TelegramSendOpts = {
   verbose?: boolean;
   mediaUrl?: string;
   maxBytes?: number;
+  messageThreadId?: number;
   api?: Bot["api"];
 };
 
@@ -88,6 +89,10 @@ export async function sendMessageTelegram(
   const bot = opts.api ? null : new Bot(token);
   const api = opts.api ?? bot?.api;
   const mediaUrl = opts.mediaUrl?.trim();
+  const threadParams =
+    typeof opts.messageThreadId === "number"
+      ? { message_thread_id: Math.trunc(opts.messageThreadId) }
+      : undefined;
 
   const sleep = (ms: number) =>
     new Promise((resolve) => setTimeout(resolve, ms));
@@ -150,35 +155,35 @@ export async function sendMessageTelegram(
       | Awaited<ReturnType<typeof api.sendDocument>>;
     if (isGif) {
       result = await sendWithRetry(
-        () => api.sendAnimation(chatId, file, { caption }),
+        () => api.sendAnimation(chatId, file, { caption, ...threadParams }),
         "animation",
       ).catch((err) => {
         throw wrapChatNotFound(err);
       });
     } else if (kind === "image") {
       result = await sendWithRetry(
-        () => api.sendPhoto(chatId, file, { caption }),
+        () => api.sendPhoto(chatId, file, { caption, ...threadParams }),
         "photo",
       ).catch((err) => {
         throw wrapChatNotFound(err);
       });
     } else if (kind === "video") {
       result = await sendWithRetry(
-        () => api.sendVideo(chatId, file, { caption }),
+        () => api.sendVideo(chatId, file, { caption, ...threadParams }),
         "video",
       ).catch((err) => {
         throw wrapChatNotFound(err);
       });
     } else if (kind === "audio") {
       result = await sendWithRetry(
-        () => api.sendAudio(chatId, file, { caption }),
+        () => api.sendAudio(chatId, file, { caption, ...threadParams }),
         "audio",
       ).catch((err) => {
         throw wrapChatNotFound(err);
       });
     } else {
       result = await sendWithRetry(
-        () => api.sendDocument(chatId, file, { caption }),
+        () => api.sendDocument(chatId, file, { caption, ...threadParams }),
         "document",
       ).catch((err) => {
         throw wrapChatNotFound(err);
@@ -192,7 +197,11 @@ export async function sendMessageTelegram(
     throw new Error("Message must be non-empty for Telegram sends");
   }
   const res = await sendWithRetry(
-    () => api.sendMessage(chatId, text, { parse_mode: "Markdown" }),
+    () =>
+      api.sendMessage(chatId, text, {
+        parse_mode: "Markdown",
+        ...threadParams,
+      }),
     "message",
   ).catch(async (err) => {
     // Telegram rejects malformed Markdown (e.g., unbalanced '_' or '*').
@@ -205,7 +214,10 @@ export async function sendMessageTelegram(
         );
       }
       return await sendWithRetry(
-        () => api.sendMessage(chatId, text),
+        () =>
+          threadParams
+            ? api.sendMessage(chatId, text, threadParams)
+            : api.sendMessage(chatId, text),
         "message-plain",
       ).catch((err2) => {
         throw wrapChatNotFound(err2);