feat(path-downloader): restrict a mirrored path package to its archivable files

PathDownloader builds an ArchivableFilesFinder and hands it to
Filesystem::mirror as the iterator that selects what to copy, so a path
package installed by mirroring drops what .gitattributes marks
export-ignore, what .gitignore excludes and the VCS directories. The
port dropped the argument, and mirrored the source tree whole.

Every method mirror() calls on the entries it walks is derived from the
pathname, so the iterator is modeled as a list of pathnames rather than
as a Traversable of SplFileInfo.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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