Record prompt field normalization

docs/roadmap/implementation.md

@@ -157,6 +157,10 @@ Validation: prompt/configuration tests plus existing domain-message tests. Inval
 roles, cache-control values, and missing required message fields still fail;
 explicit empty inline content retains its existing behavior.
 
+Completion: prompt metadata and configured message fields are normalized and
+recorded during resolution. Focused configuration and domain tests pass,
+including equivalent prompt hashes and retained input presence.
+
 ## Stage 4: Use The Single Resolved Configuration
 
 Scope: loader/target/materialization wiring and affected tests.