CutConvert RPP to PTX audio transfer

Requires Python 3.11+. Dependencies are bundled.
Run: python3 scripts/rpp-to-ptx.py /path/project.rpp --output /path/new-session
The output directory must not exist. Referenced WAV files must be available.
Read docs/rpp-to-ptx-release-requirements.md for retained and changed features.
The local tool removes browser memory caps, but retains the verified 8-track/48-kHz format limits.
