feat(k1): add local connection matrix

tests/test_xgrids_application_mqtt.py

@@ -275,6 +275,15 @@ def test_acceptance_transport_rejects_the_k1_access_point_fallback() -> None:
         ReviewedApplicationMqttTransport("192.168.56.1")
 
 
+def test_acceptance_transport_admits_the_k1_ap_only_with_an_explicit_gate() -> None:
+    transport = ReviewedApplicationMqttTransport(
+        "192.168.56.1",
+        allow_device_ap=True,
+    )
+
+    assert transport.snapshot().state == "new"
+
+
 def test_retained_control_subscription_batches_remain_exact_and_separate_from_points() -> None:
     assert [len(group) for group in CONTROL_SUBSCRIPTION_GROUPS] == [9, 5, 42]
     assert CONTROL_SUBSCRIPTION_GROUPS[0][-1] == (DEVICE_INFO_RESPONSE_TOPIC, 0)