feat(loader): wire ArrayLoader::load end-to-end (create_object/configure_object/dispatch)

Make ArrayLoader::load build and return a fully configured package for both
the CompletePackage and RootPackage class strings.

- Introduce a private CompleteOrRootPackage enum to model PHP's
  createObject(): CompletePackage return (RootPackage extends CompletePackage),
  with accessors for the inner Package, the CompletePackageInterface view, and
  conversion into a PackageInterfaceHandle.
- create_object: instantiate CompletePackage/RootPackage by class string.
- load / configure_cached_links: implement the dynamic setter dispatch
  ($package->{'set'.ucfirst($method)}($links)) via apply_link_setter.
- configure_object: wire all ~21 setters (Package inherent + CompletePackageInterface),
  source/dist with Mirror conversion, suggest self.version replacement, release
  date, and the branch-alias return (RootAliasPackage/CompleteAliasPackage).

The PHP `instanceof CompletePackage` guard in configureObject is dropped: it is
unreachable since createObject is private and returns `: CompletePackage`, an
invariant now enforced at compile time by the enum. DateTime parsing for `time`
keeps its existing approximate scaffold (noted with a TODO).

RootPackage.inner is made pub(crate) (matching CompletePackage.inner) so the
loader can reach the core Package.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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