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Add NeuroSky ThinkGear serial acquisition - #881

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Adds NEUROSKY_BOARD (69) for the 512 Hz, 16-bit TGAT/TGAM ThinkGear stream over a USB or pre-paired Bluetooth Classic serial port. EEG is converted to microvolts; signal quality, attention, meditation and eight ASIC powers are sample-and-held in auxiliary rows. The parser handles fragmented input, checksum recovery, extended rows and rejects malformed payloads atomically. Start waits for raw samples; stop/release join the reader and support restarting.

Updates C/C++, Python, C#, Java, Julia, MATLAB, Node.js, Rust and Swift board identifiers. R consumes the Python API. Documents baud rates, channel units, host timestamps and unsupported modes.

Validation: warnings-as-errors Linux native build; all 66 native tests pass; a pseudo-terminal integration test covers timeout recovery, repeated start/stop, release/reprepare and EEG values. The serial emulator is included in Linux CI. No physical MindWave/TGAM or Bluetooth transport has been tested; device-owner validation remains necessary.

References: ThinkGear protocol, NeuroSky voltage conversion.

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Codex Review Summary: ✅ Completed

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📝 Code Review ✅ Completed 2026-11-09T23:32:29.665354Z 5e70a70 PR opened
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