Write wind sensor communication

[georgesleen]

Summary

• Add wind sensor parsing helpers and a clean print API (WIND_SENSOR__print) to keep main.c minimal.
• Use fixed‑point typedefs (tenths16_t and aliases) for wind values, since the scale is explicit and
  self‑documenting, avoids mixing raw ints/floats, and keeps decimal precision without extra float overhead.
• Bonus: add/expand host unit tests and shared test helpers for NMEA/AIS/wind

Very simple unit testing

• From /firmware : make test
• Codex helped...

[georgesleen]

Need to test with actual hardware after merge