refactor: clean GSD references + shrink comments in wand/

src/test/java/com/mythlane/gravityflip/wand/WandSelectionStoreTest.java

@@ -12,11 +12,7 @@ import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
-/**
- * Pure-data tests for {@link WandSelectionStore} — no Hytale runtime dependency.
- * Covers set/get per UUID, overwrite semantics, unknown UUID default, clear,
- * and concurrent writes.
- */
+/** Tests for {@link WandSelectionStore}: set/get per UUID, overwrite, clear, concurrency. */
 class WandSelectionStoreTest {
 
     @Test