feat: govern autonomous campaign delivery schedules

tests/test_retention.py

@@ -138,3 +138,39 @@ def test_eml_retention_removes_only_terminal_artifact(tmp_path) -> None:
     assert job.eml_local_path is None
     assert job.eml_storage_key is None
     session.add.assert_called_once_with(job)
+
+
+def test_eml_retention_preserves_unfinished_autonomous_schedule_source(tmp_path) -> None:
+    now = datetime.now(timezone.utc)
+    eml_path = tmp_path / "approved-source.eml"
+    eml_path.write_bytes(b"approved message")
+    job = SimpleNamespace(
+        campaign_id="campaign-1",
+        campaign_version_id="version-1",
+        updated_at=now - timedelta(days=10),
+        queue_status="draft",
+        send_status="smtp_accepted",
+        imap_status="appended",
+        eml_local_path=str(eml_path),
+        eml_storage_key=None,
+    )
+    schedule_query = MagicMock()
+    schedule_query.filter.return_value.all.return_value = [("version-1",)]
+    job_query = MagicMock()
+    job_query.filter.return_value.order_by.return_value.all.return_value = [job]
+    session = MagicMock()
+    session.query.side_effect = [schedule_query, job_query]
+    policy = SimpleNamespace(generated_eml_retention_days=1)
+
+    result = _apply_eml_retention(
+        session,
+        dry_run=False,
+        now=now,
+        policy_for_campaign_id=lambda _campaign_id: policy,
+    )
+
+    assert result["skipped_schedule_source"] == 1
+    assert result["metadata_cleared"] == 0
+    assert eml_path.exists()
+    assert job.eml_local_path == str(eml_path)
+    session.add.assert_not_called()