The prune option uninstalled all managed Python versions (and tools)
and reinstalled them on every activation, which is slow. Instead,
resolve each requested version to the install target uv would produce
and uninstall only the difference; already-correct versions are left
untouched. Resolving to the install target (not every installed match)
also prunes superseded patch releases, which uv retains on upgrade.
Tools are diffed by PEP 503-normalized package name: requested names
are extracted and normalized at build time, and the installed set is
read from uv's tool directory, whose entries are already normalized, so
no uv output is parsed. Pruning to an empty set still removes everything.
Add programs.uv.python.{versions,default,prune} and
programs.uv.tool.{packages,prune} to install uv-managed Python versions
and tools during activation.
Install requests are passed verbatim to uv. Unpinned entries track the
latest release on each activation while pinned ones stay put: Python
requests without a patch component are installed with `uv python install
--upgrade` (exact patches, which uv refuses to upgrade, get a plain
install), and tools are refreshed with `uv tool upgrade <packages>`
scoped to the configured list. Both upgrades are scoped to the managed
entries, so installs Home Manager does not own are left untouched. prune
makes a set declarative by running `uv ... uninstall --all` before
reinstalling the listed entries.
The activation blocks run after linkGeneration so uv sees the freshly
linked uv.toml, and a null programs.uv.package is rejected once the
module emits activation commands.
