Treat nil diagnostic writers as no-output entries

docs/roadmap/remediation.md

@@ -63,6 +63,9 @@ architecture. The issues below affect behavior within the implemented structure.
 - R-06 complete: zero outcomes normalize to success/0 and empty delivery state
   normalizes to none without altering explicit domain outcomes.
 
+- R-07 complete: nil diagnostic writers are no-output entries, do not count as
+  delivery attempts, and cannot suppress cause presentation.
+
 ## Findings and priority
 
 P1 means a supported invocation is blocked or its report content is corrupted.