feat: Telegram bot integration for alerts and conversational queries

[luceinaltis]

Context

qracer/notifications/telegram_poller.py (recently merged) provides TelegramBotPoller for receiving messages. qracer/notifications/telegram_adapter.py provides TelegramAdapter for sending. The pieces exist but aren't wired into a complete conversational flow.

Goal

Enable users to interact with qracer via Telegram: receive alerts, ask questions, get briefings.

Scope

• Wire TelegramBotPoller into qracer serve event loop to receive incoming messages
• Route incoming Telegram messages to ConversationEngine.query() and send responses back
• Send autonomous monitoring alerts (feat: complete autonomous market monitoring during trading hours #161) via Telegram
• Support /briefing, /watchlist, /thesis Telegram commands
• Config: telegram.bot_token, telegram.allowed_chat_ids in config.toml
• Rate limiting and error handling for Telegram API

Related

• Depends on: telegram_poller.py (merged), telegram_adapter.py (exists)
• Enhances: autonomous monitoring (feat: complete autonomous market monitoring during trading hours #161), alerting