OpenCADStudio --serve --port <N> listens on 127.0.0.1:<N> and serves the
same line-based JSON protocol over the socket (one client at a time; the
document session persists across reconnects), as an alternative to
stdin/stdout. ocs.py grows a port= option to connect either way.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>