DEVLOG #10

I completed the calibration and evaluation pipeline for WiFi positioning
with an HLK-LD2450 reference sensor.
The new system includes:

• ESP32-C3 firmware with UART parsing, room coordinates, operating modes,
  Wi-Fi transmission, and protected configuration;
• persistent coordinate transformation with origin, rotation, and optional
  mirroring;
• synchronization of mmWave and RX1–RX4 CSI data within 150 ms;
• a 65-second empty-room reference;
• automatic room coverage with nine reachable zones (P01–P09) and six
  training blocks per zone;
• a position index that uses only CSI after calibration;
• blind evaluation with separated WiFi predictions and mmWave reference data;
• fixed quality thresholds with automatic acceptance or rejection; and
• a guided German calibration assistant in the UI.
  The PCB has also arrived. I am checking it carefully before soldering and
  starting the first complete hardware tests.
  Next: verify the PCB, solder the components, and test the full system.