docs: add F18 KL520 hardware integration specs to PRD + TDD
PRD v2.5:
- Add F18: Kneron KL520 hardware communication integration
- USB Boot mode with auto firmware loading
- JSON-RPC bridge architecture (Go → Python → SDK → USB)
- Tiny YOLO v3 inference verified (~25ms latency)
- COCO 80-class detection with NMS post-processing
TDD v1.4:
- Update 5.2: Replace placeholder driver with actual implementation
- KL720Driver with JSON-RPC over stdin/stdout
- Python bridge command protocol table
- KL520 USB Boot connection flow
- Add 8.5.13: KL520 technical mapping with architecture diagram,
inference pipeline code, YOLO post-processing specs,
Apple Silicon compatibility notes, and verified detection results
- Update 11.5: Add firmware files, kp module, and scripts directory structure
- Update directory structure to match actual driver files
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>