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

4 files changed, 49 insertions, 4 deletions

diff --git a/crates/mozart-vcs/src/downloader/git.rs b/crates/mozart-vcs/src/downloader/git.rs
index 0c78f89..814d67e 100644
--- a/crates/mozart-vcs/src/downloader/git.rs
+++ b/crates/mozart-vcs/src/downloader/git.rs
@@ -96,7 +96,7 @@ impl VcsDownloader for GitDownloader {
         Ok(())
     }
 
-    fn local_changes(&self, target: &Path) -> Result<Option<String>> {
+    fn get_local_changes(&self, target: &Path) -> Result<Option<String>> {
         if !target.join(".git").exists() {
             return Ok(None);
         }
@@ -223,6 +223,18 @@ impl VcsDownloader for GitDownloader {
         )?;
         Ok(output.stdout)
     }
+
+    fn is_change_report(&self) -> bool {
+        true
+    }
+
+    fn is_vcs_capable_downloader(&self) -> bool {
+        true
+    }
+
+    fn is_dvcs_downloader(&self) -> bool {
+        true
+    }
 }
 
 fn collect_show_ref(process: &ProcessExecutor, target: &Path) -> Result<Option<String>> {
diff --git a/crates/mozart-vcs/src/downloader/hg.rs b/crates/mozart-vcs/src/downloader/hg.rs
index 926cfa8..3230404 100644
--- a/crates/mozart-vcs/src/downloader/hg.rs
+++ b/crates/mozart-vcs/src/downloader/hg.rs
@@ -45,7 +45,7 @@ impl VcsDownloader for HgDownloader {
         Ok(())
     }
 
-    fn local_changes(&self, target: &Path) -> Result<Option<String>> {
+    fn get_local_changes(&self, target: &Path) -> Result<Option<String>> {
         if !target.join(".hg").is_dir() {
             return Ok(None);
         }
@@ -72,4 +72,16 @@ impl VcsDownloader for HgDownloader {
         )?;
         Ok(output.stdout)
     }
+
+    fn is_change_report(&self) -> bool {
+        true
+    }
+
+    fn is_vcs_capable_downloader(&self) -> bool {
+        true
+    }
+
+    fn is_dvcs_downloader(&self) -> bool {
+        false
+    }
 }
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;
 }
diff --git a/crates/mozart-vcs/src/downloader/svn.rs b/crates/mozart-vcs/src/downloader/svn.rs
index 533e15a..87b59da 100644
--- a/crates/mozart-vcs/src/downloader/svn.rs
+++ b/crates/mozart-vcs/src/downloader/svn.rs
@@ -51,7 +51,7 @@ impl VcsDownloader for SvnDownloader {
         Ok(())
     }
 
-    fn local_changes(&self, target: &Path) -> Result<Option<String>> {
+    fn get_local_changes(&self, target: &Path) -> Result<Option<String>> {
         if !target.join(".svn").is_dir() {
             return Ok(None);
         }
@@ -72,4 +72,16 @@ impl VcsDownloader for SvnDownloader {
             .execute(&["log", "-r", &range], Some(target))?;
         Ok(output.stdout)
     }
+
+    fn is_change_report(&self) -> bool {
+        true
+    }
+
+    fn is_vcs_capable_downloader(&self) -> bool {
+        true
+    }
+
+    fn is_dvcs_downloader(&self) -> bool {
+        false
+    }
 }