feat(phase-c): resolve static-property phase-b TODOs

Implement the FileDownloader::$downloadMetadata accessors over the
existing DOWNLOAD_METADATA static, and drop now-stale TODOs on the
already-correct Platform::strlen function-local static and the
ClassLoader include-closure no-op.

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

4 files changed, 9 insertions, 10 deletions

diff --git a/crates/shirabe/src/autoload/class_loader.rs b/crates/shirabe/src/autoload/class_loader.rs
index 745e9f2..083e1c3 100644
--- a/crates/shirabe/src/autoload/class_loader.rs
+++ b/crates/shirabe/src/autoload/class_loader.rs
@@ -17,7 +17,9 @@ static REGISTERED_LOADERS: LazyLock<Mutex<IndexMap<String, ClassLoader>>> =
 /// ClassLoader implements a PSR-0, PSR-4 and classmap class loader.
 #[derive(Debug, Clone)]
 pub struct ClassLoader {
-    // PHP: private static $includeFile — TODO(phase-b): stash include closure as a static
+    // PHP holds a `private static $includeFile` closure purely to run `include $file` in an
+    // isolated scope. The `include_file` shim is a free function with no `self`/`Self` access, so
+    // that scope isolation is inherent and there is no static state to keep on the Rust side.
     /// @var string|null
     vendor_dir: Option<String>,
 
@@ -491,8 +493,9 @@ impl ClassLoader {
     }
 
     fn initialize_include_closure() {
-        // TODO(phase-b): preserve PHP `\Closure::bind(static fn($file) => include $file, null, null)`
-        // Rust has no `include` operator; this is a no-op placeholder.
+        // PHP lazily binds `self::$includeFile` to a scope-isolated `include $file` closure. The
+        // Rust `include_file` shim already provides that isolation as a free function, so there is
+        // no closure to bind and this is intentionally a no-op.
     }
 
     /// PHP `(array) $loader`. Every property is private, so keys are mangled as
diff --git a/crates/shirabe/src/downloader/file_downloader.rs b/crates/shirabe/src/downloader/file_downloader.rs
index 9840cef..54b0882 100644
--- a/crates/shirabe/src/downloader/file_downloader.rs
+++ b/crates/shirabe/src/downloader/file_downloader.rs
@@ -82,14 +82,12 @@ pub struct FileDownloader {
 }
 
 impl FileDownloader {
-    /// TODO(phase-b): `$downloadMetadata` is a static property in PHP; not yet mapped to Rust.
     pub fn reset_download_metadata() {
-        todo!("FileDownloader::reset_download_metadata")
+        DOWNLOAD_METADATA.lock().unwrap().clear();
     }
 
-    /// TODO(phase-b): `$downloadMetadata` is a static property in PHP; not yet mapped to Rust.
-    pub fn download_metadata() -> indexmap::IndexMap<String, shirabe_php_shim::PhpMixed> {
-        todo!("FileDownloader::download_metadata")
+    pub fn download_metadata() -> IndexMap<String, PhpMixed> {
+        DOWNLOAD_METADATA.lock().unwrap().clone()
     }
 
     /// Constructor.
diff --git a/crates/shirabe/src/installer/installation_manager.rs b/crates/shirabe/src/installer/installation_manager.rs
index 6f691c6..17d284d 100644
--- a/crates/shirabe/src/installer/installation_manager.rs
+++ b/crates/shirabe/src/installer/installation_manager.rs
@@ -64,7 +64,6 @@ impl InstallationManager {
 
     pub fn reset(&mut self) {
         self.notifiable_packages = IndexMap::new();
-        // TODO(phase-b): FileDownloader::$downloadMetadata is a static property
         FileDownloader::reset_download_metadata();
     }
 
diff --git a/crates/shirabe/src/util/platform.rs b/crates/shirabe/src/util/platform.rs
index bb5ce1b..3866a12 100644
--- a/crates/shirabe/src/util/platform.rs
+++ b/crates/shirabe/src/util/platform.rs
@@ -270,7 +270,6 @@ impl Platform {
 
     /// @return int    return a guaranteed binary length of the string, regardless of silly mbstring configs
     pub fn strlen(str: &str) -> i64 {
-        // TODO(phase-b): function-local static; collapse to a Mutex<Option<bool>> in Phase B
         static USE_MB_STRING: Mutex<Option<bool>> = Mutex::new(None);
         let mut use_mb_string = USE_MB_STRING.lock().unwrap();
         if use_mb_string.is_none() {