feat: implement device interfaces and development guidelines for issue #25

[tylerkron]

🎯 Implements Issue #25

✅ Completed Requirements:

Core Interfaces Migrated:

• ✅ IDevice - Base interface for all DAQiFi devices
• ✅ IStreamingDevice - Interface for devices that support data streaming
• ✅ Associated connection/status enums and event args

Implementation Classes:

• ✅ DaqifiDevice - Base device implementation
• ✅ DaqifiStreamingDevice - Streaming device implementation
• ✅ ConnectionStatus enum and event args classes

Quality Assurance:

• ✅ Comprehensive XML documentation (zero warnings)
• ✅ 86 unit tests with full coverage
• ✅ .NET 8.0 and 9.0 multi-targeting
• ✅ Nullable reference types enabled
• ✅ No platform-specific dependencies
• ✅ Clean builds with zero warnings

Documentation:

• ✅ DEVICE_INTERFACES.md with comprehensive usage examples
• ✅ Thread safety guidelines
• ✅ Integration patterns
• ✅ Error handling examples

📋 Development Guidelines Added:

• ✅ Comprehensive Cursor AI rules for consistent development
• ✅ Architecture patterns and coding standards
• ✅ Domain-specific knowledge for DAQiFi hardware
• ✅ Testing patterns and documentation requirements
• ✅ Integration guidelines for consuming applications

🔧 Technical Implementation:

Interface Design:

• Generic Send<T>(IOutboundMessage<T>) method for type safety
• Event-driven architecture with StatusChanged and MessageReceived events
• Clean separation between base device and streaming functionality

Testing Strategy:

• Unit tests for all public methods and properties
• Mock implementations for testing
• Exception handling verification
• Event firing validation

🚀 Ready for Integration:

This establishes the foundation for:

• Device discovery services
• Connection management implementation
• Message consumer migration
• Channel configuration

📦 NuGet Package Ready:

• Created Daqifi.Core.1.0.0.nupkg for easy integration
• Compatible with existing daqifi-desktop architecture
• Non-breaking incremental migration path

🔄 Merge Conflict Resolution:

• Resolved dependency updates from dependabot
• Updated test packages to latest versions (Microsoft.NET.Test.Sdk 17.14.1, xunit.runner.visualstudio 3.1.1)
• All 86 tests passing on both .NET 8.0 and 9.0

🎯 Next Steps:

1. Merge this PR
2. Begin integration with daqifi-desktop
3. Implement Connection Management (next logical phase)

Closes #25