Closes #9

changelog.md

@@ -10,6 +10,14 @@ existing Git tag; subsequent changes are listed as unreleased.
 
 #### Added
 
+- Added non-owning TreeNode parent navigation and stable sibling positions;
+  disabled node moves to preserve links while retaining unique_ptr ownership.
+- Added optional read-only Qt Core DbcTreeModel with documented columns and
+  metadata roles, exact VAL_ entries, exclusive tree ownership, and reset-based
+  reload/clear support. Core remains independent of Qt.
+- Added QAbstractItemModelTester coverage, navigation/metadata/reset tests,
+  a standalone Qt-free tree test, and adapter build and usage documentation.
+
 - Added `VAL_` signal value descriptions through the statement dispatcher and
   factory, with complete syntax validation, exact signed/unsigned 64-bit keys,
   deferred reference resolution, duplicate detection, and source error locations.