Enforce explicit responsibility attribution

- document responsibility attribution as a project-wide invariant
- prevent inferred ownership in protocol rendering
- add negative gold regression for false responsibility assignment
- document future responsibility evidence and attribution model
- record the real-life benchmark finding

docs/architecture.md

@@ -47,6 +47,20 @@ Every processing step should be understandable.
 
 Intermediate results should remain inspectable throughout the pipeline.
 
+## Responsibility Attribution Integrity
+
+Responsibility, ownership, organizational roles and action-item assignments may
+be recorded only when meeting evidence explicitly assigns, accepts or confirms
+them.
+
+The system must not infer responsibility from thematic proximity,
+participation in a discussion, mentioning a task, commenting on another
+department, organizational assumptions, likely job roles, speaker adjacency or
+model world knowledge.
+
+When evidence is incomplete or ambiguous, the responsible person remains unset
+or unclear and the supporting evidence is preserved.
+
 ## Reproducible Experiments
 
 Experiments must be repeatable.