Major architectural improvement to decouple interfaces from JSON implementation:
**New Abstractions:**
- Created IDataValue interface for type-safe data access
- All interfaces now use IDataNode instead of nlohmann::json
- Enables future backend flexibility (JSON, MessagePack, etc.)
**Updated Interfaces:**
- ISerializable: serialize() returns IDataNode, deserialize() takes IDataNode
- IModule: process(), getState(), setState(), getHealthStatus() use IDataNode
- IIO: Message struct and publish() use IDataNode
- ITaskScheduler: scheduleTask() and getCompletedTask() use IDataNode
- IModuleSystem: queryModule() uses IDataNode
- IEngine: Removed JSON dependency
- IDataNode: getData(), setData(), queryByProperty() use IDataValue
**Benefits:**
- Clean separation between interface and implementation
- No JSON leakage into public APIs
- Easier testing and mocking
- Potential for multiple backend implementations
- Better encapsulation and abstraction
**Note:** Concrete implementations still use JSON internally -
this is an interface-only refactoring for better architecture.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
StillHammer
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