feat(campaign): explain governed child access

tests/test_documentation.py

@@ -105,6 +105,26 @@ def test_attachment_reuse_workflow_documents_policy_and_evidence() -> None:
     ]
 
 
+def test_access_evidence_reference_documents_independent_owner_boundaries() -> None:
+    from govoplan_campaign.backend.manifest import get_manifest
+
+    topic = next(
+        item for item in get_manifest().documentation
+        if item.id == "campaigns.access.child-evidence"
+    )
+    rendered = f"{topic.summary}\n{topic.body}".lower()
+    for expected in (
+        "governance visibility",
+        "mapping profiles",
+        "validation",
+        "reusable templates",
+        "export packages",
+        "fail closed",
+    ):
+        assert expected in rendered
+    assert "campaign.import" in topic.metadata["help_contexts"]
+
+
 def test_runtime_documentation_is_user_only_and_requires_a_campaign_task() -> None:
     assert _topics({"docs:documentation:read"}) == ()
     assert _topics({"campaigns:campaign:read"}, documentation_type="admin") == ()