pglite-oxide v0.4.0

Known broken release: The crates.io packages for 0.4.0 were published
without the generated runtime/AOT payloads, causing default bundled builds
to fail at startup with missing embedded runtime assets. Use 0.4.1 or newer.

Breaking

• Pivoted pglite-oxide to a new runtime architecture built around
  reproducible Wasmer WASIX artifacts, generated asset manifests, and
  target-specific AOT crates instead of checked-in runtime blobs
  (#13).
• Release packages now rely on CI-generated portable WASIX and native AOT
  artifacts for the exact release SHA. Applications should use the crate APIs
  instead of depending on repository asset paths.

Added

• Added extension catalog/build metadata, smoke/promoted extension manifests,
  and generated APIs for discovering bundled PostgreSQL extensions.
• Added pg_dump support and native AOT packages for the supported macOS,
  Linux, and Windows target triples.

Changed

• Reworked runtime startup, asset loading, protocol recovery, proxy behavior,
  and test coverage around the new backend.