feat(phase-c): resolve reflection/downcast phase-b TODOs

Resolve category F phase-b TODOs (class-string, instanceof, get_class,
method_exists, __FILE__, Reflection API, downcast).

- VcsRepository: dispatch drivers through a VcsDriverKind enum
  (instantiate/supports/php_class_name) and add constructors to the
  concrete VCS drivers
- repository downcasts via RepositoryInterfaceHandle::downcast_rc and
  as_any (init/show commands, vcs ValidatingArrayLoader)
- BaseCommand::is_self_update_command override replaces an instanceof
- Factory::create narrows PartialComposer to ComposerHandle via as_full
- InstalledVersions gains set_self_dir/set_installed_is_local_dir,
  replacing Reflection-based static property mutation
- ClassLoader::as_array_iter ports the PHP (array) cast
- drop the unnecessary __FILE__ phar branch in self-update

application get_class(command) reclassified TODO(plugin); buffer_io
StreamableInputInterface downcast and the ValidatingArrayLoader trait
redesign left as tracked TODOs.

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

1 files changed, 10 insertions, 2 deletions

diff --git a/crates/shirabe/src/command/base_command.rs b/crates/shirabe/src/command/base_command.rs
index 24b5a2b..d0818bf 100644
--- a/crates/shirabe/src/command/base_command.rs
+++ b/crates/shirabe/src/command/base_command.rs
@@ -279,6 +279,10 @@ pub trait HasBaseCommandData {
     fn io_mut(&mut self) -> &mut Option<Rc<RefCell<dyn IOInterface>>> {
         &mut self.base_command_data_mut().io
     }
+
+    fn is_self_update_command(&self) -> bool {
+        false
+    }
 }
 
 impl<C: HasBaseCommandData> BaseCommand for C {
@@ -352,7 +356,11 @@ impl<C: HasBaseCommandData> BaseCommand for C {
             .has_parameter_option(&["--no-scripts"], false);
 
         // TODO(phase-b): requires inner Symfony Application access for disable_plugins_by_default / disable_scripts_by_default
-        // TODO(phase-b): `$this instanceof SelfUpdateCommand` not representable
+
+        if self.is_self_update_command() {
+            disable_plugins = true;
+            disable_scripts = true;
+        }
 
         let composer = self.try_composer(Some(disable_plugins), Some(disable_scripts));
         let io = self.get_io();
@@ -503,7 +511,7 @@ impl<C: HasBaseCommandData> BaseCommand for C {
         };
         // TODO(phase-b): Option<IndexMap<String, PhpMixed>> -> Option<LocalConfigInput> conversion
         let _ = config;
-        Factory::create(io, None, disable_plugins_kind, disable_scripts)
+        Factory::create(io, None, disable_plugins_kind, disable_scripts).map(|c| c.upcast())
     }
 
     fn get_preferred_install_options(