The PyPI registry wire JSON, decoded into a typed model.

This is a placeholder boundary, the PyPI counterpart to Ecluse.Core.Registry.Npm.Wire. Écluse serves only npm, so the PyPI wire model covers just the one shape another part of the system reads from a PyPI project: the list of published version strings, taken from the releases object of the /pypi/{project}/json response. The per-release metadata (file URLs, digests, requires-python) is left as an opaque Value rather than modelled, so a full PyPI adapter can grow this module the way the npm wire layer models the packument without disturbing callers that only want the version listing.

Like the npm wire layer, the decoder is lenient: a document with no releases object yields an empty listing rather than a decode failure, so a partial or unexpected body still parses to "no versions" instead of throwing.