Allow absent version headers below structural controls

docs/config.md

@@ -334,6 +334,10 @@ declaration is accepted by the consumer's checker; it does not establish that
 each fragment conforms to a complete application schema. Final assembled
 decoding and application validation still run once.
 
+A header that is absent below a structural control follows the same omission
+policy. Actual header/control overlap is rejected, and ordinary structural
+validation and main-version ownership protection continue independently.
+
 Accepted non-main declarations are consumed from their owned payload before
 composition; their authored ancestors remain, even if empty. The main
 declaration remains in the application. Ordinary release metadata should use a