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, 24 insertions, 0 deletions

diff --git a/crates/shirabe/src/repository/vcs/github_driver.rs b/crates/shirabe/src/repository/vcs/github_driver.rs
index b3d5e05..6fc50ee 100644
--- a/crates/shirabe/src/repository/vcs/github_driver.rs
+++ b/crates/shirabe/src/repository/vcs/github_driver.rs
@@ -47,6 +47,30 @@ pub struct GitHubDriver {
 }
 
 impl GitHubDriver {
+    pub fn new(
+        repo_config: IndexMap<String, shirabe_php_shim::PhpMixed>,
+        io: std::rc::Rc<std::cell::RefCell<dyn IOInterface>>,
+        config: std::rc::Rc<std::cell::RefCell<Config>>,
+        http_downloader: std::rc::Rc<std::cell::RefCell<crate::util::HttpDownloader>>,
+        process: std::rc::Rc<std::cell::RefCell<crate::util::ProcessExecutor>>,
+    ) -> Self {
+        Self {
+            inner: VcsDriverBase::new(repo_config, io, config, http_downloader, process),
+            owner: String::new(),
+            repository: String::new(),
+            tags: None,
+            branches: None,
+            root_identifier: String::new(),
+            repo_data: None,
+            has_issues: false,
+            is_private: false,
+            is_archived: false,
+            funding_info: None,
+            allow_git_fallback: true,
+            git_driver: None,
+        }
+    }
+
     pub fn initialize(&mut self) -> Result<()> {
         let mut match_: IndexMap<CaptureKey, String> = IndexMap::new();
         if !Preg::is_match_strict_groups3(