feat(plugin): activate plugins through the PHP RPC worker

Implement the remainder of PluginManager::registerPackage: the plugin
autoload map is built by the ported createLoader/parseAutoloads and
served to the worker over the existing reverse-RPC autoloader, files
entries go through a composerRequire-equivalent glue call, and
already-defined classes take the upstream _composer_tmp rename/eval
path. Instantiation uses the new NewObject/CallPhpMethod lanes backed
by a P table in the worker; PhpPluginProxy adapts the resulting handle
to PluginInterface, with $composer/$io exposed to plugin callbacks via
an R table (unsupported methods stay explicit errors). Hand-written
proxy stubs cover Composer, PartialComposer and the IO hierarchy, and
the stub autoloader is re-prepended after loading the Composer PHP
runtime so its vendor autoloader cannot shadow proxied FQCNs.

FilesystemRepository::write now mirrors InstalledVersions::reload into
a running worker (class_exists-guarded, so an unloaded class keeps its
upstream lazy-load behavior), removing the previously undefined
observation window.

The installer pipeline passes the installed repository as a shared
handle instead of a long-lived `&mut dyn`: plugin registration runs
inside InstallationManager::execute and re-enters the same local
repository through the RepositoryManager, which would panic on the
RefCell re-borrow under the old shape.

PluginInterface lifecycle methods now take an owned ComposerHandle
(plugins retain $composer past the call) and return anyhow::Result
(PHP plugin code may throw); the plugin list uses shared ownership so
the identity comparison of removePlugin survives the dual storage in
registeredPlugins, matching PHP reference semantics.

Ports the activate/upgrade/uninstall tests of PluginInstallerTest,
serialized across the shared worker process whose persistent class
table is exactly what exercises the rename path.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

1 files changed, 9 insertions, 8 deletions

diff --git a/crates/shirabe/src/installer/installer_interface.rs b/crates/shirabe/src/installer/installer_interface.rs
index f2c0cd7c..bc464735 100644
--- a/crates/shirabe/src/installer/installer_interface.rs
+++ b/crates/shirabe/src/installer/installer_interface.rs
@@ -3,7 +3,7 @@
 use crate::installer::BinaryPresenceInterface;
 use crate::installer::PluginInstaller;
 use crate::package::PackageInterfaceHandle;
-use crate::repository::InstalledRepositoryInterface;
+use crate::repository::InstalledRepositoryInterfaceHandle;
 use shirabe_php_shim::PhpMixed;
 
 #[async_trait::async_trait(?Send)]
@@ -12,7 +12,7 @@ pub trait InstallerInterface: std::fmt::Debug {
 
     fn is_installed(
         &self,
-        repo: &mut dyn InstalledRepositoryInterface,
+        repo: &InstalledRepositoryInterfaceHandle,
         package: PackageInterfaceHandle,
     ) -> anyhow::Result<bool>;
 
@@ -29,25 +29,26 @@ pub trait InstallerInterface: std::fmt::Debug {
         prev_package: Option<PackageInterfaceHandle>,
     ) -> anyhow::Result<Option<PhpMixed>>;
 
-    // install/update/uninstall take the repository behind a RefCell: the concurrent operation
-    // chains share it, and implementations must borrow it only in synchronous sections (never
-    // across an await).
+    // install/update/uninstall take the repository as a shared handle: the concurrent operation
+    // chains share it (and re-entrant flows like plugin registration reach the same repository
+    // through RepositoryManager), so implementations must borrow it only in synchronous
+    // sections (never across an await).
     async fn install(
         &self,
-        repo: &std::cell::RefCell<&mut dyn InstalledRepositoryInterface>,
+        repo: &InstalledRepositoryInterfaceHandle,
         package: PackageInterfaceHandle,
     ) -> anyhow::Result<Option<PhpMixed>>;
 
     async fn update(
         &self,
-        repo: &std::cell::RefCell<&mut dyn InstalledRepositoryInterface>,
+        repo: &InstalledRepositoryInterfaceHandle,
         initial: PackageInterfaceHandle,
         target: PackageInterfaceHandle,
     ) -> anyhow::Result<Option<PhpMixed>>;
 
     async fn uninstall(
         &self,
-        repo: &std::cell::RefCell<&mut dyn InstalledRepositoryInterface>,
+        repo: &InstalledRepositoryInterfaceHandle,
         package: PackageInterfaceHandle,
     ) -> anyhow::Result<Option<PhpMixed>>;