fix(install): mark pacman packages explicit after --needed install

pacman --needed skips a package that is already on the system as a dependency and leaves its install reason alone. A declared package can then sit as asdeps, surface as an orphan once its accidental dependent leaves, and get swept away by an orphan cleanup. expac and lm_sensors, both maintenance-console runtime deps, nearly went this way: they were asdeps on both hosts and only survived today's orphan sweep because something still depended on them.

pacman_install now marks the package explicit after a successful install. The mark never runs on a failed install, and a mark failure never fails the install. I flipped expac and lm_sensors to explicit on ratio and velox by hand since the installer only runs on fresh systems.

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