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/json_loader.rs b/crates/shirabe/src/package/loader/json_loader.rs
index e0589bb..5f8cc4f 100644
--- a/crates/shirabe/src/package/loader/json_loader.rs
+++ b/crates/shirabe/src/package/loader/json_loader.rs
@@ -1,7 +1,7 @@
 //! ref: composer/src/Composer/Package/Loader/JsonLoader.php
 
 use crate::json::JsonFile;
-use crate::package::BasePackage;
+use crate::package::PackageInterfaceHandle;
 use crate::package::loader::LoaderInterface;
 use anyhow::Result;
 use std::path::Path;
@@ -20,7 +20,7 @@ impl JsonLoader {
         Self { loader }
     }
 
-    pub fn load(&self, json: JsonLoaderInput) -> Result<Box<dyn BasePackage>> {
+    pub fn load(&self, json: JsonLoaderInput) -> Result<PackageInterfaceHandle> {
         let config = match json {
             JsonLoaderInput::File(mut json_file) => json_file.read()?,
             JsonLoaderInput::String(ref s) if Path::new(s).exists() => {