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.

docs/mcp-analysis-tools.md

@@ -5,11 +5,12 @@ Agent 原生工具统一使用 `mcp_tjwater_` 前缀。Server目录共67项：42
 | 工具名（不含前缀） | 能力与边界 | 必要权限 |
 | --- | --- | --- |
 | `run_simulation` | 在线模拟：按水力步长直接计算业务库，不复制数据库；更新模型条件和实时基线，返回指定节点/管段，不创建方案或正式分析运行 | `simulation.run` + `scada.view` |
+| `run_burst_simulation` | 假设管道破口正向模拟；可选全网同刻在线压力差与1/3/5米水头覆盖，详见[爆管流程](burst-response-workflow.md) | `simulation.run` + `scada.view`，影响比较另需 `simulation.view` |
 | `run_burst_detection` | 指定时刻的15天压力异常侦测，至少5个完整监测节点；不定位 | `burst.run` + `scada.view` |
 | `run_burst_location` | 异常/正常压力、可选流量及漏水量假设的候选管段排序 | `burst.run` + 对应数据的 `scada.view` 或 `simulation.view` |
 | `analyze_valve_isolation` | 拓扑隔离边界、候选关阀及影响节点；不是水力计算或真实关阀 | `simulation.run` |
 | `run_leakage_identification` | SCADA压力约束下的DMA漏损分配估计；需总漏损量依据 | `burst.run` + `scada.view` |
-| `run_contaminant_simulation` | 已假设污染源的正向浓度传播；不是源头反演 | `simulation.run` + `scada.view` |
+| `run_contaminant_simulation` | 假设源正向传播；可选按全网全时段浓度汇总累计范围、首个超阈值报告时刻与峰值，详见[污染流程](water-pollution-response-workflow.md)；与工单并行，不承担反演或安全判定 | `simulation.run` + `scada.view` |
 | `analyze_valve_closure` | 给定关阀组合的水力影响 | `simulation.run` + `scada.view` |
 | `analyze_flushing` | 指定排放节点和流量的冲洗水力影响；不证明消毒合格 | `simulation.run` + `scada.view` |
 | `analyze_pressure_regulation` | 给定调泵序列、水箱初始水位的压力影响；不自动优化调度 | `simulation.run` + `scada.view` |