refactor(package): introduce Rc<RefCell<_>> handles for packages

PHP packages have reference semantics, so introduce shared-ownership
handles over an AnyPackage enum (PackageInterfaceHandle and friends)
and replace Box<dyn PackageInterface> throughout.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/crates/shirabe/src/package/loader/loader_interface.rs b/crates/shirabe/src/package/loader/loader_interface.rs
index d10b7be..586905f 100644
--- a/crates/shirabe/src/package/loader/loader_interface.rs
+++ b/crates/shirabe/src/package/loader/loader_interface.rs
@@ -1,6 +1,6 @@
 //! ref: composer/src/Composer/Package/Loader/LoaderInterface.php
 
-use crate::package::BasePackage;
+use crate::package::PackageInterfaceHandle;
 use indexmap::IndexMap;
 use shirabe_php_shim::PhpMixed;
 
@@ -9,5 +9,5 @@ pub trait LoaderInterface: std::fmt::Debug {
         &self,
         config: IndexMap<String, PhpMixed>,
         class: Option<String>,
-    ) -> anyhow::Result<Box<dyn BasePackage>>;
+    ) -> anyhow::Result<PackageInterfaceHandle>;
 }