fix(reference): keep unresolved root and Git directory reads as failures

src/reference/ReferenceSourceReader.ts

@@ -91,6 +91,13 @@ const readSource = async (
     bytesRead: state.bytesRead,
     limitations: [PATH_RACE_LIMITATION],
   };
+  if (traversal.ok && state.rootFailure?.code === "io")
+    return err({
+      tag: "reference-source-reader",
+      code: "io",
+      message: state.rootFailure.message,
+      partial: read,
+    });
   return traversal.ok ? ok(read) : err({ ...traversal.error, partial: read });
 };