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, 3 insertions, 2 deletions

diff --git a/crates/shirabe/src/repository/writable_repository_interface.rs b/crates/shirabe/src/repository/writable_repository_interface.rs
index 7094211..b5b1e35 100644
--- a/crates/shirabe/src/repository/writable_repository_interface.rs
+++ b/crates/shirabe/src/repository/writable_repository_interface.rs
@@ -2,17 +2,18 @@
 
 use crate::installer::InstallationManager;
 use crate::package::PackageInterface;
+use crate::package::PackageInterfaceHandle;
 use crate::repository::RepositoryInterface;
 use anyhow::Result;
 
 pub trait WritableRepositoryInterface: RepositoryInterface {
     fn write(&mut self, dev_mode: bool, installation_manager: &InstallationManager) -> Result<()>;
 
-    fn add_package(&mut self, package: Box<dyn PackageInterface>) -> Result<()>;
+    fn add_package(&mut self, package: PackageInterfaceHandle) -> Result<()>;
 
     fn remove_package(&mut self, package: &dyn PackageInterface) -> Result<()>;
 
-    fn get_canonical_packages(&self) -> Vec<Box<dyn PackageInterface>>;
+    fn get_canonical_packages(&self) -> Vec<PackageInterfaceHandle>;
 
     fn reload(&mut self);