refactor(composer): hold managers behind *Interface traits

Composer/PartialComposer exposed its RepositoryManager, InstallationManager,
EventDispatcher, Locker, DownloadManager, AutoloadGenerator and ArchiveManager
as concrete types, but Composer's public setters (setDownloadManager() etc.)
let plugins swap in subclasses. Introduce a *Interface trait per manager and
store each as Rc<RefCell<dyn ...Interface>> so a replacement is honored.

Only Composer's slots and the sinks fed from its accessors become trait
objects; managers injected concretely at construction keep their concrete
references, matching PHP semantics. Fluent setters on the affected classes now
return () and Locker::update_hash is de-generified to a boxed FnOnce so the
traits stay object-safe.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/crates/shirabe/src/plugin/plugin_manager.rs b/crates/shirabe/src/plugin/plugin_manager.rs
index c1cd38e..a949c03 100644
--- a/crates/shirabe/src/plugin/plugin_manager.rs
+++ b/crates/shirabe/src/plugin/plugin_manager.rs
@@ -19,7 +19,7 @@ use crate::factory::DisablePlugins;
 use crate::installer::InstallerInterface;
 use crate::io::IOInterface;
 use crate::io::IOInterfaceImmutable;
-use crate::package::Locker;
+use crate::package::LockerInterface;
 use crate::package::PackageInterfaceHandle;
 use crate::package::RootPackageInterfaceHandle;
 use crate::package::base_package::{self};
@@ -738,7 +738,7 @@ impl PluginManager {
 
     fn parse_allowed_plugins(
         allow_plugins_config: PhpMixed,
-        mut locker: Option<&mut Locker>,
+        mut locker: Option<&mut dyn LockerInterface>,
     ) -> Option<IndexMap<String, bool>> {
         // PHP: [] === $allowPluginsConfig && $locker !== null && $locker->isLocked() && version_compare($locker->getPluginApi(), '2.2.0', '<')
         let is_empty_array = allow_plugins_config