fix(k1): restore canonical local connection lifecycle

tests/test_viewer_diagnostics_api.py

@@ -55,6 +55,12 @@ def test_private_scanner_diagnostics_are_durable_structured_and_bounded(
             "automatic_retry": False,
             "side_effect_status": "unknown",
             "network_change_attempted": True,
+            "device_write_attempted": True,
+            "device_write_confirmed": False,
+            "ble_att_error_code": 4,
+            "ble_att_error_name": "INVALID_PDU",
+            "helper_stage": "compile",
+            "helper_elapsed_ms": 34720,
             "camera_source_id": "sensor.camera.right",
             "evidence_session_id": "20260728T163450Z_viewer_live",
             "activation_trigger": "application-control-scanning",
@@ -91,6 +97,12 @@ def test_private_scanner_diagnostics_are_durable_structured_and_bounded(
     assert document["automatic_retry"] is False
     assert document["side_effect_status"] == "unknown"
     assert document["network_change_attempted"] is True
+    assert document["device_write_attempted"] is True
+    assert document["device_write_confirmed"] is False
+    assert document["ble_att_error_code"] == 4
+    assert document["ble_att_error_name"] == "INVALID_PDU"
+    assert document["helper_stage"] == "compile"
+    assert document["helper_elapsed_ms"] == 34720
     assert document["camera_source_id"] == "sensor.camera.right"
     assert document["evidence_session_id"] == "20260728T163450Z_viewer_live"
     assert document["activation_trigger"] == "application-control-scanning"