fix(telegram): add missing Provider field in native commands context

Native commands like /elevated were failing with 'provider (ctx.Provider)'
gate error because the context object was missing the Provider field.

The context already set Surface and OriginatingChannel to 'telegram' but
not Provider, which is required by resolveElevatedPermissions().

src/telegram/bot-native-commands.ts

@@ -463,6 +463,7 @@ export const registerTelegramNativeCommands = ({
             SenderName: buildSenderName(msg),
             SenderId: senderId || undefined,
             SenderUsername: senderUsername || undefined,
+            Provider: "telegram",
             Surface: "telegram",
             MessageSid: String(msg.message_id),
             Timestamp: msg.date ? msg.date * 1000 : undefined,