Meta Package Manager Files

[!NOTE] 6.4.1 is available on 🐍 PyPI and 🐙 GitHub.

• [guix] Drop the >=1.0.0 version requirement and add a hex-hash regex variant. Guix is a rolling-release distribution: guix pull-managed installs and in-tree dev wrappers (./pre-inst-env guix, ./scripts/guix) report a git commit hash as the "version", which the previous >=1.0.0 specifier rejected as not satisfying the requirement and made mpm skip the manager. The new version_regexes chain accepts stable releases (1.4.0), git describe-style versions (1.4.0-7-gabc1234), and bare 7–40-char lowercase hex hashes, so any working guix registers as available.
• [mpm] Add PackageManager.unavailable_reason and use it in the pool's "Skip" log line. When mpm drops a manager from selection, the message now spells out why it was dropped: not supported on '<sysname>', no executable named '<names>' found in PATH, '<path>' is not executable, could not parse version from '<path>' output, or version <X> does not satisfy '<spec>' requirement. Replaces the previous opaque Skip unavailable <id> manager. line.
• [mpm] Move --cov and --cov-report=term from pyproject.toml [tool.pytest].addopts into the CI workflow. Removes pytest-cov as an unconditional test-time dependency for downstream packagers.
• [mpm] Move --numprocesses=auto, --dist=loadgroup, and --maxschedchunk=1 from pyproject.toml [tool.pytest].addopts into the CI workflow. Removes pytest-xdist as an unconditional test-time dependency for downstream packagers.
• [zypper] Loosen xmltodict floor from >=1 to >=0.12. The parse() API I rely on in managers/zypper.py has been stable since 0.12, so the bump to 1.0 was cosmetic and forced downstream packagers to ship a newer release than necessary.
• [mpm] Drop more-itertools dependency. The single peekable use site in pool.py is replaced with a next(iterator, None) empty-check using stdlib only. Removes one transitive dependency for downstream packagers.
• [choco] Move Chocolatey package files from packaging/choco/ into packaging/choco/meta-package-manager/ so the directory name matches the nuspec basename, as required by Chocolatey-AU's Update-Package. Fixes the 🍫 Chocolatey release job that was failing with No nuspec file found in the package directory.
• [mpm] Add choco-source, nix-source, and guix-source jobs to tests-install.yaml that build and install from the in-repo packaging specs (packaging/choco/meta-package-manager/, packaging/nix/, packaging/guix/). The workflow now also triggers on pushes and pull requests touching packaging/{choco,nix,guix}/**, so changes to in-repo specs are validated before merge.
• [mpm] Render the chocolatey, guix, and nix release-PR bodies through repomatic pr-body --template-file .github/pr-templates/update-package-spec.md.noformat. PRs now include the standard <details> workflow-metadata block (trigger, actor, ref, commit, job, workflow, run links), the refresh-tip admonition pointing at the workflow's dispatch URL, and the attribution footer, matching every other PR opened by repomatic-driven jobs across kdeldycke/* repositories.

Full changelog: v6.4.0...v6.4.1

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