The shell pointed HERMES_PYTHON at the bare pm-pinned interpreter and reached
the uv2nix site-packages only through PYTHONPATH. Every consumer that replaces
PYTHONPATH (Ink's gateway bootstrap, image attachments, run_tests.sh's env -i)
got an interpreter with no dependencies, so 'hermes --tui' in the shell failed
with 'No module named ruamel'.
devVenv re-homes uv2nix's editable venv onto the pinned interpreter: a real
pyvenv.cfg whose home is the lock's python, devPython's site-packages, and
console scripts re-shebanged onto it. HERMES_PYTHON, VIRTUAL_ENV, python,
pytest and pm are now one interpreter and the shell sets no PYTHONPATH.
The shipped package and the shell share one tool list: runtimeDeps takes
ripgrep and ffmpeg from pm/lock.json too. Reverts the run_tests.sh PYTHONPATH
passthrough, which leaked a caller's PYTHONPATH into every HERMES_PYTHON run.
The dev-venv-self-contained check runs the venv under env -i.
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