Add automatic Telegram notifications for ERROR and FATAL level logs.
Features:
- TelegramSink: Custom Serilog sink for Telegram API integration
- Conditional logging: Only ERROR and FATAL levels trigger alerts
- Environment variables: TELEGRAM_BOT and CHAT_ID from Gitea Secrets
- Non-blocking: Telegram failures don't crash application
Configuration:
- Reads TELEGRAM_BOT and CHAT_ID from environment
- Formatted messages with emoji, timestamp, and exception details
- Markdown parsing for better Telegram presentation
This enables real-time alerting for critical issues during:
- Gate 3 Shadow Run execution
- Production deployments
- System errors and exceptions
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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