feat(investigations): add event impact and work-order feedback flows

Add isolated burst and pollution impact evidence, parallel work-order workflows, persisted notifications and graph updates.

Checkpoint current code. Known follow-ups remain for large pollution result previews and graceful geometry failure.

tests/unit/test_mcp_work_order_skills.py

@@ -19,6 +19,7 @@ from app.mcp.work_order_skills import read_work_order_skill
     ("water_quality_complaint", "water-quality-complaint"),
     ("general", "appointment-follow-up"),
     ("scada_anomaly", "scada-anomaly"),
+    ("water_pollution", "water-pollution-event"),
 ])
 def test_skill_descriptor_and_body_have_same_version_and_digest(workflow, name):
     descriptor = read_work_order_skill(workflow)
@@ -59,9 +60,20 @@ def test_scada_instructions_advance_candidate_analysis_independently_of_source_l
     assert not any(word in text for word in ("演示", "mock", "location_demo", "只发布回放成果"))
 
 
-def test_task_skill_uses_persisted_workflow_and_preserves_task_scope(monkeypatch):
+def test_pollution_instructions_offer_work_order_before_simulation_and_reuse_the_investigation():
+    skill = read_work_order_skill("water_pollution", include_content=True)
+    text = skill["instructions"]
+    assert text.index("propose_task_action") < text.index("run_contaminant_simulation")
+    assert "include_impact_coverage=true" in text and "不等模拟完成才发起工单" in text
+    assert "同一 task_id" in text and "不覆盖已审核工单或绕过版本校验" in text
+    assert "模型曲线不填观测专用 chart.scada" in text
+    assert "不能把浊度、余氯下降或感官描述直接换算成污染源浓度" in text
+
+
+@pytest.mark.parametrize("workflow", ["burst_report", "water_quality_complaint", "water_pollution"])
+def test_task_skill_uses_persisted_workflow_and_preserves_task_scope(monkeypatch, workflow):
     task_id, project_id = uuid4(), uuid4()
-    reader = AsyncMock(return_value={"task": {"workflow": "burst_report"}})
+    reader = AsyncMock(return_value={"task": {"workflow": workflow}})
     monkeypatch.setattr(query_service.reads, "task_context_summary", reader)
     monkeypatch.setattr(query_service, "permissions_for_context", lambda project: {"operational_task.view"})
     scope = SimpleNamespace(connection=object(), project=object())
@@ -80,7 +92,15 @@ def test_task_skill_uses_persisted_workflow_and_preserves_task_scope(monkeypatch
     body = query("skill")
     assert summary.data["handling_skill"]["content_sha256"] == body.data["skill"]["content_sha256"]
     assert summary.data["display_time_zone"] == "Asia/Shanghai"
-    assert body.data["skill"]["workflow"] == "burst_report"
+    assert body.data["skill"]["workflow"] == workflow
+    for result in (summary, body):
+        assert ("source_trace_capability" in result.data) == (workflow == "water_pollution")
+        if workflow == "water_pollution":
+            assert result.data["source_trace_capability"]["tool"] == "run_contaminant_source_trace"
+            capability = result.data["source_trace_capability"]
+            assert capability["work_order_wait_blocks_analysis"] is False
+            assert capability["simulation_parameters"] == {"include_impact_coverage": True}
+            assert capability["next_steps"].index("propose_task_action") < capability["next_steps"].index("run_contaminant_simulation")
     assert body.data["skill"]["instructions"] and not body.truncated
     assert body.evidence_id is None and body.semantics == "task"
     reader.assert_awaited_with(scope.connection, project_id=project_id, task_id=task_id, report_revision=None)