The resolver combined the locked patch with a newer release tag.
That combination did not name the archive advertised by the release.
Return the complete identity from an exact matching filename instead.
Keep the locked minor and reject free-threaded or mismatched-tag assets.
The URL builder supplies its existing target mapping to the resolver.
Bionic remains a manual source. No version pins change in this commit.
Verified: 47 tests passed. The real package caller reconstructs each
accepted asset name, with negative controls for lookalikes and tag skew.
A fresh upstream metadata snapshot agrees with all six PBS target URLs.
No interpreter artifacts were downloaded or installed.
