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- MxStatusMapper: maps all 40+ MxStatusDetail codes, MxStatusCategory, and MxStatusSource to human-readable names and client messages - OnDataChange: checks MXSTATUS_PROXY.success and overrides quality with specific OPC UA code when MxAccess reports a failure (e.g., CommFailure, ConfigError, WaitingForInitialData) - OnWriteComplete: uses MxStatusMapper.FormatStatus for structured logging - Write errors: catches COMException separately with HRESULT in message - Read errors: distinguishes COM, timeout, and generic failures in logging Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>