feat(python-client): operator credentials on acknowledge-alarm

Claude-Session: https://claude.ai/code/session_016J6isfcgqy4SB2RK3ZvFvT

clients/python/tests/test_review_findings_022_to_026.py

@@ -771,6 +771,7 @@ def test_cli_stream_alarms_positive_max_messages_remains_finite(monkeypatch) ->
 
 
 def test_cli_acknowledge_alarm_happy_path(monkeypatch) -> None:
+    monkeypatch.setenv("MXGW_TEST_OPPW", "pw-secret")
     stub = _BulkFakeStub()
     stub.acknowledge_alarm = _BulkFakeUnary(
         [
@@ -798,12 +799,19 @@ def test_cli_acknowledge_alarm_happy_path(monkeypatch) -> None:
             "investigating",
             "--operator",
             "alice",
+            "--operator-domain",
+            "CORP",
+            "--operator-password-env",
+            "MXGW_TEST_OPPW",
             "--json",
         ],
     )
 
     assert result.exit_code == 0, result.output
+    assert "pw-secret" not in result.output
     captured_request = stub.acknowledge_alarm.requests[0]
+    assert captured_request.operator_domain == "CORP"
+    assert captured_request.operator_password == "pw-secret"
     assert captured_request.alarm_full_reference == "Tank01.Level.HiHi"
     assert captured_request.comment == "investigating"
     assert captured_request.operator_user == "alice"