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, 17 insertions, 26 deletions

diff --git a/crates/shirabe/src/command/reinstall_command.rs b/crates/shirabe/src/command/reinstall_command.rs
index 95fde5ae..0d3567a2 100644
--- a/crates/shirabe/src/command/reinstall_command.rs
+++ b/crates/shirabe/src/command/reinstall_command.rs
@@ -244,32 +244,23 @@ impl Command for ReinstallCommand {
 
         let uninstall_operations: Vec<AnyOperation> =
             uninstall_operations.into_iter().map(Into::into).collect();
-        {
-            let mut local_repo_ref = local_repo.borrow_mut();
-            let repo = local_repo_ref
-                .as_installed_repository_interface_mut()
-                .expect("local repository must be an InstalledRepositoryInterface");
-            installation_manager.borrow_mut().execute(
-                repo,
-                uninstall_operations,
-                dev_mode,
-                true,
-                false,
-            )?;
-        }
-        {
-            let mut local_repo_ref = local_repo.borrow_mut();
-            let repo = local_repo_ref
-                .as_installed_repository_interface_mut()
-                .expect("local repository must be an InstalledRepositoryInterface");
-            installation_manager.borrow_mut().execute(
-                repo,
-                install_operations.clone(),
-                dev_mode,
-                true,
-                false,
-            )?;
-        }
+        let repo = crate::repository::InstalledRepositoryInterfaceHandle::from_repository_handle(
+            &local_repo,
+        );
+        installation_manager.borrow_mut().execute(
+            &repo,
+            uninstall_operations,
+            dev_mode,
+            true,
+            false,
+        )?;
+        installation_manager.borrow_mut().execute(
+            &repo,
+            install_operations.clone(),
+            dev_mode,
+            true,
+            false,
+        )?;
 
         if !input
             .borrow()