refactor(downloader): turn DownloadManager into downloader registry

Reshape DownloadManager from a hard-coded VCS match into a registry of
DownloaderInterface instances keyed by source type, mirroring
Composer's DownloadManager — with prefer-source/dist preferences, an
IO handle, and a files cache. ArchiveManager now resolves dist
sources through a shared DownloadManager instead of calling
download_dist directly, and Composer::require / try_load take an IO
so it flows through the factory wiring.

1 files changed, 3 insertions, 1 deletions

diff --git a/crates/mozart/src/commands/validate.rs b/crates/mozart/src/commands/validate.rs
index a6dbf91..23925c5 100644
--- a/crates/mozart/src/commands/validate.rs
+++ b/crates/mozart/src/commands/validate.rs
@@ -104,7 +104,9 @@ pub async fn execute(
     // Load the Composer project state (optional — used for typed config,
     // locker, and the repository/installation managers). Mirrors
     // `ValidateCommand::createComposerInstance($file)`.
-    let composer = Composer::try_load_from_file(&file).ok().flatten();
+    let composer = Composer::try_load_from_file(io.clone(), &file)
+        .ok()
+        .flatten();
 
     // Determine whether to check the lock file using the typed config when
     // available, falling back to a raw JSON read for paths where the Composer