pub const KIND: &str = "isolated_venv";Expand description
kind: string operators write in CPEX YAML to declare a Python plugin
that runs out-of-process in its own virtualenv.
This supersedes issue #20’s python:// in-process framing: the host runs
the plugin in a subprocess, not via PyO3, so the runtime never links
libpython and a plugin crash cannot take the gateway down.