fix(ai): suppress sealed slo watchdog meta noise

apps/api/tests/test_ai_slo_calculator.py

@@ -3,7 +3,10 @@ from __future__ import annotations
 from datetime import datetime, timedelta
 from zoneinfo import ZoneInfo
 
-from src.jobs.ai_slo_watchdog_job import _format_slo_violation_for_alert
+from src.jobs.ai_slo_watchdog_job import (
+    _format_slo_violation_for_alert,
+    _is_observation_only_slo_violation,
+)
 from src.services.ai_slo_calculator import (
     SLO_AUTO_SUCCESS_MIN,
     SloMetric,
@@ -176,3 +179,92 @@ def test_watchdog_formats_auto_execute_diagnostics_for_meta_alert():
     assert cause is not None
     assert "Top failure groups" in cause
     assert "不需要重啟服務或改寫歷史資料" in cause
+
+
+def test_watchdog_treats_sealed_auto_execute_slo_as_observation_only():
+    report = SloReport(
+        metrics=[
+            SloMetric(
+                name="auto_execute_success_rate",
+                value=0.83,
+                threshold=SLO_AUTO_SUCCESS_MIN,
+                direction="above",
+                sample_count=53,
+                violated=True,
+            )
+        ],
+        any_violated=True,
+        diagnostics={
+            "auto_execute_success_rate": {
+                "status": "sealed_waiting_window",
+                "open_failure_group_count": 0,
+            }
+        },
+    )
+
+    assert _is_observation_only_slo_violation(
+        report,
+        ["auto_execute_success_rate"],
+    )
+
+
+def test_watchdog_keeps_auto_execute_slo_alert_when_open_groups_remain():
+    report = SloReport(
+        metrics=[
+            SloMetric(
+                name="auto_execute_success_rate",
+                value=0.83,
+                threshold=SLO_AUTO_SUCCESS_MIN,
+                direction="above",
+                sample_count=53,
+                violated=True,
+            )
+        ],
+        any_violated=True,
+        diagnostics={
+            "auto_execute_success_rate": {
+                "status": "needs_investigation",
+                "open_failure_group_count": 1,
+            }
+        },
+    )
+
+    assert not _is_observation_only_slo_violation(
+        report,
+        ["auto_execute_success_rate"],
+    )
+
+
+def test_watchdog_keeps_slo_alert_when_other_metric_violates():
+    report = SloReport(
+        metrics=[
+            SloMetric(
+                name="auto_execute_success_rate",
+                value=0.83,
+                threshold=SLO_AUTO_SUCCESS_MIN,
+                direction="above",
+                sample_count=53,
+                violated=True,
+            ),
+            SloMetric(
+                name="human_override_rate",
+                value=0.25,
+                threshold=0.20,
+                direction="below",
+                sample_count=10,
+                violated=True,
+            ),
+        ],
+        any_violated=True,
+        diagnostics={
+            "auto_execute_success_rate": {
+                "status": "sealed_waiting_window",
+                "open_failure_group_count": 0,
+            }
+        },
+    )
+
+    assert not _is_observation_only_slo_violation(
+        report,
+        ["auto_execute_success_rate", "human_override_rate"],
+    )