Closes #23

changelog.md

@@ -6,6 +6,20 @@ existing Git tag; subsequent changes are listed as unreleased.
 
 ## Unreleased
 
+### 2026-10-20
+
+#### Added
+
+- Expose stable frame and signal keys from Qt-free tree nodes using the existing
+  runtime identifier types. Document missing-key cases and identity rules.
+- Expand standalone navigation tests and add a Qt-free qmake test target covering
+  ownership transfer, vector growth, bounds, key identity, and cycle rejection.
+
+#### Fixed
+
+- Reject self/ancestor insertion before consuming child ownership, preventing
+  cycles while preserving parent links. Keep node copying and movement disabled.
+
 ### 2026-10-14
 
 #### Fixed