Add Telegram messenger as alternative to phone calls

[alexfilatov]

Summary

This PR adds Telegram as an alternative communication channel alongside the existing phone call functionality. Users can now choose between:

Mode	Cost	Setup Time	Best For
Telegram	Free	2 minutes	Text-based, quick responses
Phone	~$0.03/min	10 minutes	Voice, hands-free, away from computer

Changes

New Files

• server/src/providers/telegram.ts - Telegram Bot API provider
• server/src/telegram-chat.ts - Chat manager with long-polling for user responses
• server/src/index-telegram.ts - MCP server entry point for Telegram mode

Modified Files

• server/package.json - Added start:telegram and dev:telegram scripts
• server/src/providers/index.ts - Export Telegram provider
• .claude-plugin/plugin.json - Added callme-telegram MCP server
• .claude-plugin/marketplace.json - Added Telegram plugin option
• .env.example - Added Telegram configuration options
• README.md - Added Telegram quick start guide and tools documentation

Telegram Tools

Tool	Description
send_message	Start conversation, wait for response
continue_chat	Follow-up messages
notify_user	One-way notifications (no response expected)
end_chat	Close conversation

Setup (2 minutes)

1. Message @BotFather → /newbot → copy token
2. Message @userinfobot → copy your ID
3. Add to ~/.claude/settings.json:

{
  "env": {
    "CALLME_TELEGRAM_BOT_TOKEN": "your-token",
    "CALLME_TELEGRAM_CHAT_ID": "your-id"
  }
}

4. Install: /plugin install callme@callme-telegram

Benefits

• Free - No phone provider costs, no OpenAI TTS/STT costs
• No ngrok required - Uses Telegram's long-polling API
• Simple setup - Only 2 environment variables needed
• Non-breaking - Existing phone functionality unchanged

Test Plan

• Telegram bot sends messages successfully
• Long-polling receives user responses
• MCP server starts and registers tools
• Plugin configuration loads correctly