feat(vcs): wire cache-vcs-dir setting through to drivers

DriverConfig used to expose a generic cache_dir hardcoded to a
relative ".cache/mozart/vcs", with each driver appending its own
"git"/"hg" subdir. As a result, the cache-vcs-dir setting (and
COMPOSER_CACHE_VCS_DIR env var) had no effect on where mirrors
were actually stored.

Replace cache_dir with cache_vcs_dir, resolving its default the
same way Composer does (COMPOSER_CACHE_VCS_DIR → COMPOSER_CACHE_DIR/vcs
→ XDG/HOME fallbacks), and have GitDriver/HgDriver use it directly.
This brings the Mozart cache layout in line with Composer's: a single
shared vcs root with one subdirectory per sanitized URL.

1 files changed, 1 insertions, 1 deletions

diff --git a/crates/mozart-vcs/src/driver/git.rs b/crates/mozart-vcs/src/driver/git.rs
index 43f4ecb..090a5fa 100644
--- a/crates/mozart-vcs/src/driver/git.rs
+++ b/crates/mozart-vcs/src/driver/git.rs
@@ -27,7 +27,7 @@ impl GitDriver {
     pub fn new(url: &str, config: DriverConfig) -> Self {
         let is_local = Self::is_local_path(url);
         let process = ProcessExecutor::new();
-        let git_util = GitUtil::new(process, config.cache_dir.join("git"));
+        let git_util = GitUtil::new(process, config.cache_vcs_dir.clone());
         Self {
             url: url.to_string(),
             repo_dir: if is_local {