A one-off `pip install "diet_guard @ git+..."` from a scratch
directory was used during the original cutover; that's a non-editable
snapshot that a later git push silently never reaches. Document the
correct deployment convention (install.sh from a durable ~/diet-guard
clone) so this doesn't drift again.
Rewrites python_pkg.diet_guard imports to diet_guard, vendors the
shared as_float coercion helper, drops the monorepo PYTHONPATH from
install.sh and the systemd unit (package is now pip-installed), and
scaffolds standalone lint/test config matching testsAndMisc's real
enforced bar (pylint --fail-under=10 with tests excluded and the
use-implicit-booleaness/consider-using-with disables, mypy's actual
disabled-error-code set, ruff ALL, bandit, 100% branch coverage).
