🤖 Telegram bot endpoint with audio support

Summary

Add a Telegram bot endpoint so an Antigravity Agent can serve as a Telegram chatbot with full audio/voice message support.

Requirements

• Telegram Bot: Use telegram-bot-ruby gem (or similar) to run a long-polling bot
• Audio Support: Receive voice messages, transcribe them, send audio responses
• Skills Integration: Bot should load configurable skills (local + GitHub)
• Conversation State: Maintain per-user conversation context
• Configuration: All secrets in .env (TELEGRAM_BOT_TOKEN, GEMINI_API_KEY)
• Example: examples/08_skill_telegram_bot.rb — runnable via rv run ruby

Inspiration

Borrow patterns from ~/git/emorr-agy (Telegram + audio + Gemini integration).

Stretch Goals

• Inline keyboard for skill selection
• /skills command to list loaded skills
• /postmortem command to trigger SRE skill
• Audio response via TTS

Priority

P2 — high-impact demo that showcases SDK versatility.

Start with the requirements and the proposed entry point, examples/08_skill_telegram_bot.rb, then inspect the existing SDK patterns and the referenced emorr-agy integration. Confirm how telegram-bot-ruby, the .env values, configurable skills, audio messages, and per-user state should fit together. Done means the example runs via rv run ruby and supports the required Telegram text and audio flow.