Two fixes for `equo rescue spmsync` on a system without an existing
installed packages DB:
1. client/interfaces/methods.py: Stop falling back to a GenericRepository
(in-memory, read-only for handlePackage) when the DB file is absent.
Instead let SQLite create the file; call initializeRepository() on a
freshly created DB so validate() succeeds. Corrupted DBs still fall
back to RAM via the existing DatabaseError/SystemDatabaseError path.
2. spm/portage_plugin: Also catch OSError (not just tarfile.ReadError)
when uncompress_tarball fails on a pure-XPAK temp file; Python 3.14
raises OSError in this case rather than tarfile.ReadError.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Mario Fetka
d7ddf15fac