Implements AlertDispatcher with multi-channel delivery support: - DiscordChannel using webhook URL with embed formatting - TelegramChannel using Bot API with MarkdownV2 - Rate limiting per channel (configurable) - Circuit breaker pattern for failing channels - Async delivery with retry and exponential backoff - 23 comprehensive tests 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>