…473)Extracted from#472.

_Resolves #474_# ProblemIssue#472 requires session-scoped fixtures.Currently, we use `set_home`, `gitconfig`, and `hgconfig` to `monkeypatch.setenv` `$HOME`, pointing it to a temporary directory with user-specific configuration files. This ensures all subsequent `git` and `hg` commands automatically load these configurations.However, [`monkeypatch.setenv`](https://docs.pytest.org/en/8.3.x/reference/reference.html#pytest.MonkeyPatch.setenv) doesn't work with function-scoped fixtures.# Improvement```❯ hyperfine \  --warmup 3 \  --runs 10 \  --prepare 'git checkout master' \  --command-name 'libvcs 0.31.0' \  'py.test' \  --prepare 'git checkout pytest-config' \  --command-name 'with improved hg/git config fixtures' \  'py.test'Benchmark 1: libvcs 0.31.0  Time (mean ± σ):     15.150 s ±  0.751 s    [User: 16.650 s, System: 4.720 s]  Range (min … max):   14.235 s … 16.741 s    10 runsBenchmark 2: with improved hg/git config fixtures  Time (mean ± σ):     15.014 s ±  0.307 s    [User: 17.246 s, System: 4.865 s]  Range (min … max):   14.458 s … 15.642 s    10 runsSummary  with improved hg/git config fixtures ran    1.01 ± 0.05 times faster than libvcs 0.31.0```# Changes## pytest fixtures: Session-scoped `hgconfig` and `gitconfig`These are now set by `set_hgconfig` and `set_gitconfig`, which set `HGRCPATH` and `GIT_CONFIG`, instead of overriding `HOME`.

# ProblemGit, Subversion, and Mercurial repositories are unnecessarily reinitialized for each test via libvcs' pytest plugin.- We're not utilizing session-based scoping.  - A single initial repo could be created, then copied to [`tmp_path`](https://docs.pytest.org/en/8.3.x/how-to/tmp_path.html#the-tmp-path-fixture) using [`shutil.copytree`](https://docs.python.org/3/library/shutil.html#shutil.copytree) ([source](https://github.com/python/cpython/blob/v3.13.0/Lib/shutil.py#L550-L605)).# Improvement```❯ hyperfine \  --warmup 3 \  --runs 10 \  --prepare 'pip uninstall -y libvcs && pip install "libvcs==0.30.1"' \  --command-name 'libvcs 0.30.1' \  'py.test' \  --prepare 'pip uninstall -y libvcs && pip install "libvcs==0.31.0"' \  --command-name 'libvcs 0.31.0' \  'py.test' \  --prepare 'pip uninstall -y libvcs && pip install "libvcs==0.32.1"' \  --command-name 'libvcs 0.32.1' \  'py.test'Benchmark 1: libvcs 0.30.1  Time (mean ± σ):      4.784 s ±  0.116 s    [User: 4.641 s, System: 0.846 s]  Range (min … max):    4.599 s …  4.971 s    10 runsBenchmark 2: libvcs 0.31.0  Time (mean ± σ):      3.436 s ±  0.115 s    [User: 2.821 s, System: 0.470 s]  Range (min … max):    3.347 s …  3.678 s    10 runsBenchmark 3: libvcs 0.32.1  Time (mean ± σ):      3.173 s ±  0.054 s    [User: 2.726 s, System: 0.388 s]  Range (min … max):    3.104 s …  3.295 s    10 runsSummary  libvcs 0.32.1 ran    1.08 ± 0.04 times faster than libvcs 0.31.0    1.51 ± 0.04 times faster than libvcs 0.30.1```# Changes## libvcs 0.30.1 -> 0.32.1See also:-https://github.com/vcs-python/libvcs/blob/v0.32.1/CHANGES#libvcs-0310-2024-10-12-https://libvcs.git-pull.com/history.html#libvcs-0-32-1-2024-10-12# Appendix-vcs-python/libvcs#472