fix(metrics): read latest sitewide visual qa artifact

tests/test_ai_automation_smoke_service.py

@@ -335,6 +335,59 @@ def test_scheduled_automation_health_summary_can_use_current_smoke_without_recor
     assert not history_path.exists()
 
 
+def test_scheduled_automation_health_summary_falls_back_to_visual_qa_artifact(tmp_path, monkeypatch):
+    from datetime import datetime
+    from services import ai_automation_smoke_service as smoke
+    from services import ai_surface_html_readback_service as surface_service
+
+    history_path = tmp_path / "smoke_history.jsonl"
+    history_path.write_text(
+        json.dumps({
+            "generated_at": datetime.now().isoformat(timespec="seconds"),
+            "status": "ok",
+            "summary": {"ok": 9, "warning": 0, "critical": 0, "total": 9},
+            "checks": [],
+        }, ensure_ascii=False) + "\n",
+        encoding="utf-8",
+    )
+    monkeypatch.setattr(smoke, "_HISTORY_PATH", str(history_path))
+    monkeypatch.setattr(
+        surface_service,
+        "build_sitewide_visual_qa_readback",
+        lambda **_kwargs: {
+            "policy": "read_only_sitewide_visual_qa_readback_v1",
+            "status": "ok",
+            "artifact_path": "data/ai_automation/sitewide_visual_qa_latest.json",
+            "artifact_exists": True,
+            "artifact_generated_at": "2026-07-03T07:40:00",
+            "next_machine_action": "keep_sitewide_visual_qa_monitoring",
+            "summary": {
+                "result_count": 147,
+                "route_count": 49,
+                "viewport_count": 3,
+                "pass_count": 147,
+                "failed_count": 0,
+                "overflow_issue_count": 0,
+                "visual_offender_count": 0,
+                "stale": False,
+            },
+        },
+    )
+
+    summary = smoke.build_scheduled_automation_health_summary(
+        history_limit=5,
+        freshness_max_age_hours=9999,
+    )
+
+    visual_family = next(
+        item for item in summary["families"]
+        if item["key"] == "sitewide_visual_qa"
+    )
+    assert visual_family["status"] == "ok"
+    assert visual_family["details"]["route_count"] == 49
+    assert visual_family["details"]["failed_count"] == 0
+
+
 def test_scheduled_automation_health_summary_route_returns_compact_payload(tmp_path, monkeypatch):
     from datetime import datetime
     from flask import Flask