Center Muse S Athena EEG samples around zero - #856
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Summary
1 << 13) before scaling Muse S Athena EEG samplesWhy
Athena EEG samples are unpacked as unsigned 14-bit values. A zero-level input is therefore encoded around 8192, so scaling the raw code directly leaves an approximately 725 µV DC pedestal after the scale-factor correction from #855.
This changes the output representation from unsigned, offset values to zero-centered EEG values. It does not remove electrode drift or other physiological low-frequency/DC components.
Fixes the midpoint-handling part of #854.
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