refactor(vcs): mirror Composer interfaces; rename get_local_changes

- Rename `local_changes` → `get_local_changes` to match Composer's
  `getLocalChanges`
- Add `is_change_report`, `is_vcs_capable_downloader`,
  `is_dvcs_downloader` trait methods to replace PHP `instanceof` checks
- Add `VersionParser` stub to keep `VersionGuesser::new` signature
  compatible with Composer's constructor
- Add `ArrayDumper` in status.rs mirroring
  `Composer\Package\Dumper\ArrayDumper`; expand `build_package_config`
  to include all fields that `VersionGuesser` inspects

1 files changed, 10 insertions, 1 deletions

diff --git a/crates/mozart-vcs/src/downloader/mod.rs b/crates/mozart-vcs/src/downloader/mod.rs
index 8948921..352f330 100644
--- a/crates/mozart-vcs/src/downloader/mod.rs
+++ b/crates/mozart-vcs/src/downloader/mod.rs
@@ -25,7 +25,7 @@ pub trait VcsDownloader {
     /// Detect local changes in the working copy.
     /// Returns `None` if clean, `Some(diff)` if modified.
     /// Mirrors `Composer\Downloader\ChangeReportInterface::getLocalChanges`.
-    fn local_changes(&self, target: &Path) -> Result<Option<String>>;
+    fn get_local_changes(&self, target: &Path) -> Result<Option<String>>;
 
     /// Detect commits present locally but not on the tracking remote.
     /// Returns `None` if there are no unpushed commits or the concept does
@@ -44,4 +44,13 @@ pub trait VcsDownloader {
 
     /// Get commit log between two references.
     fn commit_logs(&self, from: &str, to: &str, target: &Path) -> Result<String>;
+
+    /// instanceof ChangeReportInterface
+    fn is_change_report(&self) -> bool;
+
+    /// instanceof VcsCapableDownloaderInterface
+    fn is_vcs_capable_downloader(&self) -> bool;
+
+    /// instanceof DvcsDownloaderInterface
+    fn is_dvcs_downloader(&self) -> bool;
 }