Default remains ~/.local. Setting prefix=/usr/local (via
/etc/bakery/config.toml or BAKERY_PREFIX) installs bins and share
under that prefix and systemd user units under /usr/lib/systemd/user.
Writes that need root use sudo -n, then pkexec. State stays per-user.
bakery --version is compiled from workspace.package.version; bakery list
reports the git tag. Those must match at tag time. 0.7.2 is unreleased
work after v0.7.1 — no tag in this commit.