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Add TelegramCommandHandler class with long polling, command routing, and security features. Changes: - Add TelegramCommandHandler class to telegram_client.py - Implement long polling with getUpdates API - Add command registration and routing mechanism - Implement chat ID verification for security - Add comprehensive tests (16 tests) - Coverage: 85% for telegram_client.py Features: - start_polling() / stop_polling() lifecycle management - register_command() for handler registration - Chat ID verification to prevent unauthorized access - Error isolation (command failures don't crash system) - Graceful handling of API errors and timeouts Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>