Schedule sibling inheritance by dependency readiness

docs/config.md

@@ -220,6 +220,13 @@ value of null cancels a relationship without looking up a parent. Other value
 types, missing or non-mapping parents, and cycles fail the load with value-free
 diagnostics.
 
+Within each sibling scope, direct mapping definitions resolve by dependency
+readiness. A parent is resolved before a child; among currently eligible
+definitions, the lexically smallest canonical semantic pointer is selected,
+including newly eligible definitions as soon as their parent completes. This
+ordering governs inheritance operations and their history, controls, and
+transfers. It does not reorder the mappings in the resulting configuration.
+
 `extends` is reserved structural input across ordinary and layered loads, every
 source kind, imports, selected overlays, and explicit CLI overrides. It is
 consumed before typed decoding and need not appear in the application's Go