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, 0 deletions

diff --git a/crates/shirabe/src/installed_versions.rs b/crates/shirabe/src/installed_versions.rs
index 77d653f..fb6e8bf 100644
--- a/crates/shirabe/src/installed_versions.rs
+++ b/crates/shirabe/src/installed_versions.rs
@@ -423,6 +423,16 @@ impl InstalledVersions {
         *INSTALLED_IS_LOCAL_DIR.lock().unwrap() = false;
     }
 
+    /// PHP mutates the private static `$selfDir` via Reflection. Rust exposes a mutating function.
+    pub fn set_self_dir(dir: String) {
+        *SELF_DIR.lock().unwrap() = Some(dir);
+    }
+
+    /// PHP mutates the private static `$installedIsLocalDir` via Reflection. Rust exposes a mutating function.
+    pub fn set_installed_is_local_dir(value: bool) {
+        *INSTALLED_IS_LOCAL_DIR.lock().unwrap() = value;
+    }
+
     /// @return string
     fn get_self_dir() -> String {
         let mut self_dir = SELF_DIR.lock().unwrap();