feat(package): implement PackageInterface accessor layer for Package/CompletePackage/RootPackage

Fill the trait-impl todo!() across the package accessor layer so loaded
packages are actually usable (the ArrayLoader::load path depends on it):

- Package: implement BasePackage/PackageInterface from struct fields and
  existing inherent methods; Display via get_unique_name.
- CompletePackage: delegate PackageInterface to inner Package.
- RootPackage: delegate CompletePackageInterface/PackageInterface to inner
  CompletePackage; RootPackageInterface link setters delegate to Package.

Correct three unfaithful trait signatures found during implementation:

- get_target_dir returns Option<String> (PHP computes a normalized value;
  a borrow cannot represent it, and AliasPackage could not implement &str
  across its aliasOf handle).
- RootPackageInterface link setters take IndexMap<String, Link>, matching
  Package and the real ArrayLoader caller (PHP RootPackage inherits
  Package::setRequires; the Link[] docblock was imprecise).
- get_full_pretty_version takes a DisplayMode enum instead of a raw i64;
  the match is now exhaustive, so it returns String without an error path.

Move mirror conversion to the boundaries: PackageInterface mirror methods
use Vec<Mirror> (the typed form, matching the inherent methods), with
array<->Mirror conversion done by the producer (ComposerRepository) and
consumer (ArrayDumper).

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

1 files changed, 2 insertions, 3 deletions

diff --git a/crates/shirabe/src/dependency_resolver/operation/mark_alias_uninstalled_operation.rs b/crates/shirabe/src/dependency_resolver/operation/mark_alias_uninstalled_operation.rs
index b9ad26e..41b0979 100644
--- a/crates/shirabe/src/dependency_resolver/operation/mark_alias_uninstalled_operation.rs
+++ b/crates/shirabe/src/dependency_resolver/operation/mark_alias_uninstalled_operation.rs
@@ -3,7 +3,6 @@
 use crate::dependency_resolver::operation::OperationInterface;
 use crate::dependency_resolver::operation::SolverOperation;
 use crate::package::AliasPackageHandle;
-use crate::package::PackageInterface;
 
 #[derive(Debug)]
 pub struct MarkAliasUninstalledOperation {
@@ -38,11 +37,11 @@ impl OperationInterface for MarkAliasUninstalledOperation {
             "Marking <info>{}</info> (<comment>{}</comment>) as uninstalled, alias of <info>{}</info> (<comment>{}</comment>)",
             self.package.get_pretty_name(),
             self.package
-                .get_full_pretty_version(true, <dyn PackageInterface>::DISPLAY_SOURCE_REF_IF_DEV),
+                .get_full_pretty_version(true, crate::package::DisplayMode::SourceRefIfDev),
             self.package.get_alias_of().get_pretty_name(),
             self.package
                 .get_alias_of()
-                .get_full_pretty_version(true, <dyn PackageInterface>::DISPLAY_SOURCE_REF_IF_DEV,),
+                .get_full_pretty_version(true, crate::package::DisplayMode::SourceRefIfDev,),
         )
     }