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lib/gnss: RMC, GGA, GSA and GSV into one GnssState: Fix type, position, altitude, speed, course, HDOP, UTC time (trusted only with a Fix) and the satellites in view across constellations. GSV sequences are kept per constellation and signal band and merged per satellite with the stronger SNR; GSA's system ID marks which satellites are used. 16 tests, using lines captured from the device. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT