- Implemented complete CurrentDemandRes encoder following C grammar states 317-329
- Added EncodeCurrentDemandResType with proper response code, DC_EVSEStatus, voltage/current values
- Added EncodeDC_EVSEStatusType for EVSE status with optional isolation status
- Fixed missing EncodeString and EncodeMeterInfo methods for string and meter data encoding
- Added EncodeInteger64 for 64-bit TMeter field support
- Fixed type conversions (uint to int) for proper bit stream encoding
- Verified encoding functionality with CurrentDemandRes test XML
- Encoder now supports both CurrentDemandReq and CurrentDemandRes as minimum requirement
- Structured for expansion to support all ISO 15118 message types (universal codec)
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Co-Authored-By: Claude <noreply@anthropic.com>