Retain K1 connection between scans and admit the next named acquisition

tests/test_xgrids_application_acceptance.py

@@ -367,6 +367,17 @@ def test_canonical_session_owns_start_active_scan_stop_and_save_boundary() -> No
     assert response_evidence[0]["operation_key"] == "bootstrap:1:DeviceInfoRequest"
     assert response_evidence[-1]["operation_key"] == "modeling:stop"
     assert all("payload" not in item for item in response_evidence)
+    before_batches = list(transport.batches)
+    standby_pumps = len(transport.maintain_calls)
+    transport.pre_start_ready = lambda _binding: True
+    executor.maintain_standby_until_next_acquisition(
+        lambda: len(transport.maintain_calls) >= standby_pumps + 3,
+    )
+    assert transport.batches == before_batches
+    assert len(transport.maintain_calls) == standby_pumps + 3
+    # A next dialogue must use a fresh transport, not reset one-shot guards.
+    with pytest.raises(ApplicationAcceptanceError):
+        executor.run_connection_stage(orchestrator)
     assert APPLICATION_KEY not in str(executor.snapshot())
     assert VENDOR_DEVICE_ID not in str(executor.snapshot())
     TypeAdapter(JsonValue).validate_python(executor.snapshot())