The Hermes Docker image's venv is built with `uv sync`, which does not
bootstrap pip into the venv. When the google-workspace setup script needs
to install its deps and the running interpreter has no pip,
`sys.executable -m pip install` dead-ends with "No module named pip"
(reported via Discord support).
install_deps() now falls back to `uv pip install --python <interpreter>`
when the pip path fails and uv is on PATH. uv installs into the exact
interpreter the script is running under without needing pip present, so
the pip-less venv self-heals (e.g. a dep evicted on image update, or a
build without the [google]/[all] extra). On environments with neither
pip nor uv, the [google] extra hint is printed as before.
Verified E2E against nousresearch/hermes-agent:latest: under the venv
python with a missing dep, --install-deps now prints "Dependencies
installed." and exits 0 instead of failing.
Adds TestInstallDeps regression coverage: pip path, uv fallback,
uv-not-consulted-when-pip-works control, and both no-installer-available
and uv-also-fails failure cases.
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