Enhance matching module with reference identity and caching improvements

- Introduced a new `RefIdentity` type to store reference details (name and className) in the matching process.
- Updated `VCache` and `SCache` structures to include references, improving the handling of reference comparisons during matching.
- Modified `cacheVirtual` and `cacheStudio` functions to support reference caching, enhancing performance and accuracy in matching.
- Improved `countOwnDiffs` function to account for reference mismatches, ensuring more precise cost calculations.
- Added comprehensive tests to validate the new reference handling and caching mechanisms.

These changes significantly enhance the efficiency and accuracy of the matching process in the application.

tests/tests/serve.rs

@@ -5,7 +5,7 @@ use tempfile::tempdir;
 
 use crate::rojo_test::{
     internable::InternAndRedact,
-    serve_util::{run_serve_test, serialize_to_xml_model},
+    serve_util::{run_serve_test, serialize_to_xml_model, TestServeSession},
 };
 
 use librojo::web_api::SocketPacketType;
@@ -961,6 +961,24 @@ fn ref_path_nonexistent_target_no_crash() {
     });
 }
 
+/// When a non-default project file is used (e.g. `named.project.json5`
+/// instead of `default.project.json5`), tree validation must snapshot
+/// through the project middleware — not walk the parent directory as a
+/// generic Folder. Regression test for a bug where `check_tree_freshness`
+/// and `reconcile_tree` used `folder_location()` instead of the project
+/// file path, causing the entire repo root to be walked (including
+/// unrelated directories with potentially malformed files).
+#[test]
+fn non_default_project_file_tree_validation() {
+    let _ = env_logger::try_init();
+
+    let mut session =
+        TestServeSession::new_with_project_file("non_default_project", "named.project.json5");
+    let _info = session.wait_to_come_online();
+
+    session.assert_tree_fresh();
+}
+
 /// Multiple Rojo_Ref_* attributes on the same instance should all resolve.
 #[test]
 fn ref_path_multiple_attributes() {