docs(campaign): define broker redelivery evidence

tests/test_celery_redelivery_acceptance.py

@@ -128,6 +128,21 @@ def test_compose_redis_is_isolated_durable_and_health_checked() -> None:
     assert "campaign-redis-data:/data" in compose
 
 
+def test_runbook_keeps_local_redelivery_distinct_from_production_supervision() -> None:
+    testbed = (REPOSITORY_ROOT / "dev" / "mail-testbed" / "README.md").read_text(
+        encoding="utf-8"
+    )
+    runbook = (REPOSITORY_ROOT / "docs" / "CAMPAIGN_DELIVERY_RUNBOOK.md").read_text(
+        encoding="utf-8"
+    )
+
+    assert "run_celery_redelivery_acceptance.py" in testbed
+    assert "same Celery task identity must be redelivered" in testbed
+    assert "production daemon supervision" in testbed
+    assert "empty broker queue/unacked set" in runbook
+    assert "production process manager" in runbook
+
+
 def test_compose_lifecycle_targets_only_isolated_redis_service() -> None:
     up = runner._compose_command(
         compose_file=COMPOSE_PATH,