feat: add Telegram connector package for mesh-to-chat bridging

Introduces @claudemesh/connector-telegram — a standalone bridge process
that joins a mesh as peerType: "connector" and relays messages
bidirectionally between a Telegram chat and mesh peers via long polling.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/connector-telegram/src/config.ts

@@ -0,0 +1,32 @@
+export interface TelegramConnectorConfig {
+  // Telegram
+  telegramBotToken: string; // from @BotFather
+  telegramChatId: string; // group chat or user chat ID
+
+  // Mesh
+  brokerUrl: string;
+  meshId: string;
+  memberId: string;
+  pubkey: string;
+  secretKey: string;
+  displayName: string; // e.g. "Telegram-DevChat"
+}
+
+export function loadConfigFromEnv(): TelegramConnectorConfig {
+  const required = (key: string): string => {
+    const val = process.env[key];
+    if (!val) throw new Error(`Missing required env var: ${key}`);
+    return val;
+  };
+
+  return {
+    telegramBotToken: required("TELEGRAM_BOT_TOKEN"),
+    telegramChatId: required("TELEGRAM_CHAT_ID"),
+    brokerUrl: required("BROKER_URL"),
+    meshId: required("MESH_ID"),
+    memberId: required("MEMBER_ID"),
+    pubkey: required("PUBKEY"),
+    secretKey: required("SECRET_KEY"),
+    displayName: process.env.DISPLAY_NAME || "Telegram",
+  };
+}