BIDS export pipeline

ResXR does not generate full BIDS Motion outputs at runtime. Instead:

• Unity records CSV + session_metadata.json
• A Python analysis pipeline converts those outputs into Motion-BIDS-compliant structure.

Motivation:

• Subject/session IDs may not be known at runtime
• BIDS formatting is easier and safer offline

The metadata includes key fields needed for conversion:

• tracking_origin_type
• reference_frames descriptions
• device model + OS version strings
• schema + units conventions (rotation degrees, etc.)

(Scans TSV and channels JSON are produced later by the pipeline, not by Unity.)