Add lsf2positions command to export vehicle positions at 1-second intervals

[Copilot]

Exports vehicle positions from EstimatedState messages in LSF log files, computing actual WGS-84 coordinates by translating reference lat/lon by north/east offsets.

Changes

• New command: cmd/lsf2positions/main.go

  • Filters EstimatedState messages (MGID 350) to 1-second intervals
  • Converts lat/lon from radians to degrees
  • Applies WGS-84 offset translation: deltaLat = x / R, deltaLon = y / (R * cos(lat))
  • Exports CSV: timestamp, latitude_deg, longitude_deg, depth_m, altitude_m

• Build integration: Added to dist.sh for cross-platform builds

• Documentation: Added usage example to README

Usage

go run cmd/lsf2positions/main.go -lsf Data.lsf -out positions.csv

Output:

timestamp,latitude_deg,longitude_deg,depth_m,altitude_m
1234567890.123,41.18567123,-8.70456789,2.50,45.30
1234567891.234,41.18568456,-8.70455123,2.52,45.28

Original prompt

Create a new command that exports the positions of the vehicle at 1 second separation. You can use EstimatedState but take into account that you must compute the location by translating wgs84 lat and longitude by the offsets (x, y, z) that correspond to (north, east, down in meters). See other commands that already exist for inspiration. Lat and lon are in radians in EstimatedState (must convert to degrees). Final result shall be in degrees and meters (depth, altitude)

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