Release v0.0.2

Added

• NEO-M9N GPS support with UBX protocol configuration (up to 25 Hz)
• Loop rate, ZUPT rate, and EKF/GPS metrics in diagnostics dashboard
• configure_wt901.py and probe_wt901.py tools for IMU configuration
• take_new_fix() method in GPS parser for accurate fix counting

Changed

• GPS rate now counts only valid RMC position fixes (excludes GGA/GSA sentences)
• ZUPT display changed from cumulative count to rate per minute (rolling average)
• Improved diagnostics accuracy for sensor rate monitoring

Fixed

• GPS rate showing inflated values (~3x actual) due to counting all NMEA sentences
• ZUPT count growing unboundedly (now shows useful rate metric)