整合求解器活动监控与步长回归证据

同步远端 PNL0003 诊断和大采样网格能力，语义合并活动感知的 60 秒真停滞判定与旧后端 15 分钟兼容兜底。

纳管热路径优化、15 单元运行证据、浏览器与 API 报告，并补充北京时间更新日志和遗留问题。

frontend/playwright.live.config.ts

@@ -0,0 +1,59 @@
+import { defineConfig } from "@playwright/test";
+import { fileURLToPath } from "node:url";
+
+const channel = process.env.PLAYWRIGHT_CHANNEL?.trim();
+const executablePath = process.env.PLAYWRIGHT_EXECUTABLE_PATH?.trim();
+const frontendRoot = fileURLToPath(new URL(".", import.meta.url));
+const repositoryRoot = fileURLToPath(new URL("..", import.meta.url));
+const simulationEnvironment = {
+  ...process.env,
+  SIMULATION_CAUSAL_EXECUTOR_V2: "1",
+  SIMULATION_CAUSAL_COORDINATE_KERNEL: "1",
+  SIMULATION_CAUSAL_DIRECT_SUM_ASSIGNMENTS: "1",
+  SIMULATION_CAUSAL_DIRECT_EQUATION_READERS: "1",
+  SIMULATION_CAUSAL_FAST_PATH: "1",
+  SIMULATION_MECHANICAL_ATOL_MODE: "legacy",
+  SIMULATION_ODE_JACOBIAN_MODE: "scipy",
+  SIMULATIONAPP_PROPERTY_CACHE: "on",
+};
+
+export default defineConfig({
+  testDir: "./tests/e2e",
+  fullyParallel: false,
+  workers: 1,
+  timeout: 600_000,
+  expect: {
+    timeout: 15_000,
+  },
+  outputDir: "test-results/live-mql8",
+  use: {
+    baseURL: "http://127.0.0.1:14173",
+    ...(channel ? { channel } : {}),
+    ...(executablePath ? { launchOptions: { executablePath } } : {}),
+    headless: true,
+    viewport: { width: 1440, height: 900 },
+    screenshot: "only-on-failure",
+    trace: "on",
+  },
+  webServer: [
+    {
+      command:
+        ".venv/bin/python -m uvicorn app.main:app --host 127.0.0.1 --port 18181",
+      cwd: repositoryRoot,
+      env: simulationEnvironment,
+      url: "http://127.0.0.1:18181/api/components/catalog",
+      reuseExistingServer: false,
+      timeout: 120_000,
+      gracefulShutdown: { signal: "SIGTERM", timeout: 10_000 },
+    },
+    {
+      command:
+        "node --input-type=module -e \"import { createServer } from 'vite'; import react from '@vitejs/plugin-react'; const server = await createServer({ configFile: false, root: process.cwd(), plugins: [react()], server: { host: '127.0.0.1', port: 14173, strictPort: true, proxy: { '/api': 'http://127.0.0.1:18181' } } }); await server.listen();\"",
+      cwd: frontendRoot,
+      url: "http://127.0.0.1:14173",
+      reuseExistingServer: false,
+      timeout: 120_000,
+      gracefulShutdown: { signal: "SIGTERM", timeout: 10_000 },
+    },
+  ],
+});

frontend/src/App.tsx

@@ -109,8 +109,12 @@ import {
   lmechn1RightPortCount,
 } from "./componentSymbols/mechanical";
 import {
+  SIMULATION_ACTIVITY_STALL_TIMEOUT_MS,
+  SIMULATION_ACTIVITY_STALL_TIMEOUT_SECONDS,
+  SIMULATION_SOLVER_STALL_TIMEOUT_MINUTES,
+  SIMULATION_SOLVER_STALL_TIMEOUT_MS,
+  solverActivityStallTimeoutMessage,
   solverStallTimeoutMessage,
-  solverStallTimeoutReached,
 } from "./simulationTimeout";
 import {
   CONTACT_AWARE_EDGE_TYPE,
@@ -1053,6 +1057,37 @@ type SimulationStreamIssue = {
   message?: string;
 };
 
+type SimulationActivityTelemetry = {
+  activitySequence?: number;
+  activityKind?: string;
+  currentTrialTime?: number | null;
+  rhsCallCount?: number;
+  acceptedStepSequence?: number;
+  acceptedTime?: number | null;
+};
+
+export type SimulationActivityWatchdogStatus =
+  | "progressing"
+  | "slow-active"
+  | "slow-telemetry-unavailable"
+  | "stalled";
+
+export type SimulationActivityWatchdogState = {
+  lastAcceptedProgressAt: number;
+  lastActivityChangeAt: number | null;
+  lastActivitySequence: number | null;
+  lastAcceptedStepSequence: number | null;
+  lastAcceptedTime: number | null;
+  integratingPhaseActive: boolean;
+};
+
+export type SimulationActivityWatchdogObservation = {
+  status: SimulationActivityWatchdogStatus;
+  acceptedProgressIdleMs: number;
+  activityIdleMs: number | null;
+  activityTelemetryAvailable: boolean;
+};
+
 type SimulationCancelReason = "user" | "stalled";
 
 type SimulationTaskResponse = {
@@ -1064,7 +1099,7 @@ type SimulationTaskResponse = {
 };
 
 type SimulationStreamEvent =
-  | {
+  | ({
       event: "progress";
       progress: number;
       phase: string;
@@ -1072,7 +1107,7 @@ type SimulationStreamEvent =
       heartbeat?: boolean;
       simulatedTime?: number;
       totalTime?: number;
-    }
+    } & SimulationActivityTelemetry)
   | {
       event: "result";
       progress: number;
@@ -1092,6 +1127,137 @@ type SimulationStreamEvent =
       simulatedTime?: number;
       totalTime?: number;
     };
+
+export function createSimulationActivityWatchdog(
+  now = Date.now(),
+): SimulationActivityWatchdogState {
+  return {
+    lastAcceptedProgressAt: now,
+    lastActivityChangeAt: null,
+    lastActivitySequence: null,
+    lastAcceptedStepSequence: null,
+    lastAcceptedTime: null,
+    integratingPhaseActive: false,
+  };
+}
+
+export function isSimulationSolverActivityPhase(phase: string): boolean {
+  return phase === "integrating";
+}
+
+export function observeSimulationActivityWatchdog(
+  current: SimulationActivityWatchdogState,
+  event: SimulationActivityTelemetry & { heartbeat?: boolean; phase?: string },
+  now = Date.now(),
+  stallTimeoutMs = SIMULATION_ACTIVITY_STALL_TIMEOUT_MS,
+  legacyStallTimeoutMs = SIMULATION_SOLVER_STALL_TIMEOUT_MS,
+): {
+  state: SimulationActivityWatchdogState;
+  observation: SimulationActivityWatchdogObservation;
+} {
+  const reportsPhase = typeof event.phase === "string";
+  if (reportsPhase && !isSimulationSolverActivityPhase(event.phase!)) {
+    return {
+      state: createSimulationActivityWatchdog(now),
+      observation: {
+        status: "progressing",
+        acceptedProgressIdleMs: 0,
+        activityIdleMs: null,
+        activityTelemetryAvailable: false,
+      },
+    };
+  }
+
+  const baseline =
+    reportsPhase && !current.integratingPhaseActive
+      ? {
+          ...createSimulationActivityWatchdog(now),
+          integratingPhaseActive: true,
+        }
+      : current;
+  let acceptedProgress = event.heartbeat !== true;
+  let lastAcceptedStepSequence = baseline.lastAcceptedStepSequence;
+  let lastAcceptedTime = baseline.lastAcceptedTime;
+
+  if (
+    typeof event.acceptedStepSequence === "number" &&
+    Number.isFinite(event.acceptedStepSequence)
+  ) {
+    if (
+      lastAcceptedStepSequence !== null &&
+      event.acceptedStepSequence !== lastAcceptedStepSequence
+    ) {
+      acceptedProgress = true;
+    }
+    lastAcceptedStepSequence = event.acceptedStepSequence;
+  }
+  if (typeof event.acceptedTime === "number" && Number.isFinite(event.acceptedTime)) {
+    if (lastAcceptedTime !== null && event.acceptedTime !== lastAcceptedTime) {
+      acceptedProgress = true;
+    }
+    lastAcceptedTime = event.acceptedTime;
+  }
+
+  let lastActivityChangeAt = baseline.lastActivityChangeAt;
+  let lastActivitySequence = baseline.lastActivitySequence;
+  const reportsActivitySequence =
+    typeof event.activitySequence === "number" &&
+    Number.isFinite(event.activitySequence);
+  if (reportsActivitySequence) {
+    if (
+      lastActivitySequence === null ||
+      event.activitySequence !== lastActivitySequence
+    ) {
+      lastActivityChangeAt = now;
+    }
+    lastActivitySequence = event.activitySequence!;
+  }
+
+  const lastAcceptedProgressAt = acceptedProgress
+    ? now
+    : baseline.lastAcceptedProgressAt;
+  const acceptedProgressIdleMs = Math.max(0, now - lastAcceptedProgressAt);
+  const activityIdleMs =
+    lastActivityChangeAt === null
+      ? null
+      : Math.max(0, now - lastActivityChangeAt);
+  const effectiveStallTimeoutMs = Math.max(0, stallTimeoutMs);
+  const effectiveLegacyStallTimeoutMs = Math.max(
+    effectiveStallTimeoutMs,
+    legacyStallTimeoutMs,
+  );
+  let status: SimulationActivityWatchdogStatus = "progressing";
+  if (acceptedProgressIdleMs >= effectiveStallTimeoutMs) {
+    if (!reportsActivitySequence || activityIdleMs === null) {
+      status =
+        acceptedProgressIdleMs >= effectiveLegacyStallTimeoutMs
+          ? "stalled"
+          : "slow-telemetry-unavailable";
+    } else if (activityIdleMs >= effectiveStallTimeoutMs) {
+      status = "stalled";
+    } else {
+      status = "slow-active";
+    }
+  }
+
+  return {
+    state: {
+      lastAcceptedProgressAt,
+      lastActivityChangeAt,
+      lastActivitySequence,
+      lastAcceptedStepSequence,
+      lastAcceptedTime,
+      integratingPhaseActive:
+        reportsPhase || baseline.integratingPhaseActive,
+    },
+    observation: {
+      status,
+      acceptedProgressIdleMs,
+      activityIdleMs,
+      activityTelemetryAvailable: reportsActivitySequence,
+    },
+  };
+}
 const SUPPORTED_SOLVER_METHODS = ["BDF", "Radau", "LSODA", "RK45", "RK23", "DOP853"];
 const simulationConfigLabels: Record<SimulationNumericKey, string> = {
   t_start: "起始时间",
@@ -7355,10 +7521,11 @@ function FlowWorkbench() {
       setSimulationStopPending(false);
       let lastLoggedPhase = "";
       let lastLoggedBucket = -1;
+      let lastWatchdogStatus: SimulationActivityWatchdogStatus = "progressing";
       try {
         const result = await streamSystemSimulation(
           xml,
-          (event) => {
+          (event, watchdog) => {
             if (event.event !== "progress") {
               return;
             }
@@ -7373,14 +7540,38 @@ function FlowWorkbench() {
               "initialization",
               "initializing",
             ].includes(event.phase);
+            const progressMessage =
+              watchdog?.status === "slow-active"
+                ? `正在处理耗时积分步，内部计算仍活跃${
+                    event.activityKind ? `（${event.activityKind}）` : ""
+                  }，可手动停止`
+                : watchdog?.status === "slow-telemetry-unavailable"
+                  ? "积分步耗时较长，后端未提供活动遥测；任务保持运行，可手动停止"
+                  : event.message;
             setSimulationProgress((current) => ({
               ...current,
               state: "running",
               percent: normalizedProgress.percent,
-              message: event.message,
+              message: progressMessage,
               simulatedTime: normalizedProgress.simulatedTime,
               totalTime: normalizedProgress.totalTime,
             }));
+            if (watchdog && watchdog.status !== lastWatchdogStatus) {
+              if (watchdog.status === "slow-active") {
+                appendConsoleEntry(
+                  "warning",
+                  `积分步超过 ${SIMULATION_ACTIVITY_STALL_TIMEOUT_SECONDS} 秒尚未接受，但后端内部活动仍在推进；继续等待，可随时手动停止`,
+                );
+              } else if (watchdog.status === "slow-telemetry-unavailable") {
+                appendConsoleEntry(
+                  "warning",
+                  `积分步超过 ${SIMULATION_ACTIVITY_STALL_TIMEOUT_SECONDS} 秒尚未接受，且后端未提供活动遥测；将按 ${SIMULATION_SOLVER_STALL_TIMEOUT_MINUTES} 分钟保守上限继续等待，可手动停止`,
+                );
+              } else if (lastWatchdogStatus !== "progressing") {
+                appendConsoleEntry("info", "求解器已接受新的积分步，仿真继续推进");
+              }
+              lastWatchdogStatus = watchdog.status;
+            }
             const progressBucket = Math.floor(normalizedProgress.percent / 10);
             if (event.phase !== lastLoggedPhase || progressBucket !== lastLoggedBucket) {
               const progressDetail = reportsSimulationTime
@@ -7404,7 +7595,9 @@ function FlowWorkbench() {
           appendConsoleEntry(
             "error",
             error.code === "SOLVER_STALLED"
-              ? solverStallTimeoutMessage("recovering")
+              ? error.message.includes("内部活动")
+                ? solverActivityStallTimeoutMessage("recovering")
+                : solverStallTimeoutMessage("recovering")
               : "超过 30 秒未收到后端数据，正在终止任务并恢复部分结果",
           );
           try {
@@ -10882,7 +11075,10 @@ async function readSimulationStreamChunk(
 
 async function streamSystemSimulation(
   xml: string,
-  onEvent: (event: SimulationStreamEvent) => void,
+  onEvent: (
+    event: SimulationStreamEvent,
+    watchdog?: SimulationActivityWatchdogObservation,
+  ) => void,
   simulationId: string,
 ): Promise<SimulationResult> {
   const abortController = new AbortController();
@@ -10920,7 +11116,7 @@ async function streamSystemSimulation(
   const decoder = new TextDecoder();
   let buffer = "";
   let result: SimulationResult | null = null;
-  let lastSolverProgressAt = Date.now();
+  let activityWatchdog = createSimulationActivityWatchdog();
 
   const consumeLine = (line: string) => {
     const trimmed = line.trim();
@@ -10936,23 +11132,28 @@ async function streamSystemSimulation(
       throw new SimulationStreamError("仿真服务返回了无法识别的进度消息");
     }
     const event = parsed as SimulationStreamEvent;
+    let watchdogObservation: SimulationActivityWatchdogObservation | undefined;
     if (event.event === "progress") {
-      if (
-        event.heartbeat === true &&
-        solverStallTimeoutReached(lastSolverProgressAt)
-      ) {
-        throw new SimulationStreamError(
-          solverStallTimeoutMessage("detected"),
-          [],
-          undefined,
-          "SOLVER_STALLED",
-        );
-      }
-      if (event.heartbeat !== true) {
-        lastSolverProgressAt = Date.now();
+      const watched = observeSimulationActivityWatchdog(
+        activityWatchdog,
+        event,
+      );
+      activityWatchdog = watched.state;
+      if (isSimulationSolverActivityPhase(event.phase)) {
+        watchdogObservation = watched.observation;
+        if (watchdogObservation.status === "stalled") {
+          throw new SimulationStreamError(
+            watchdogObservation.activityTelemetryAvailable
+              ? solverActivityStallTimeoutMessage("detected")
+              : solverStallTimeoutMessage("detected"),
+            [],
+            undefined,
+            "SOLVER_STALLED",
+          );
+        }
       }
     }
-    onEvent(event);
+    onEvent(event, watchdogObservation);
     if (event.event === "result") {
       result = event.result;
       return;

frontend/src/simulationTimeout.ts

@@ -1,6 +1,9 @@
 export const SIMULATION_SOLVER_STALL_TIMEOUT_MINUTES = 15;
 export const SIMULATION_SOLVER_STALL_TIMEOUT_MS =
   SIMULATION_SOLVER_STALL_TIMEOUT_MINUTES * 60_000;
+export const SIMULATION_ACTIVITY_STALL_TIMEOUT_SECONDS = 60;
+export const SIMULATION_ACTIVITY_STALL_TIMEOUT_MS =
+  SIMULATION_ACTIVITY_STALL_TIMEOUT_SECONDS * 1_000;
 
 export function solverStallTimeoutReached(
   lastSolverProgressAt: number,
@@ -17,3 +20,12 @@ export function solverStallTimeoutMessage(
     ? `${prefix}，正在终止任务并恢复部分结果`
     : `${prefix}，任务可能已经卡死`;
 }
+
+export function solverActivityStallTimeoutMessage(
+  context: "detected" | "recovering",
+) {
+  const prefix = `求解器的接受步和内部活动均连续 ${SIMULATION_ACTIVITY_STALL_TIMEOUT_SECONDS} 秒没有变化`;
+  return context === "recovering"
+    ? `${prefix}，正在终止任务并恢复部分结果`
+    : `${prefix}，任务可能已经卡死`;
+}

frontend/tests/e2e/simulation-activity-watchdog.spec.ts

@@ -0,0 +1,252 @@
+import { expect, test } from "@playwright/test";
+import {
+  createSimulationActivityWatchdog,
+  isSimulationSolverActivityPhase,
+  observeSimulationActivityWatchdog,
+} from "../../src/App";
+
+const TEST_STALL_TIMEOUT_MS = 1_000;
+
+test("首个含 activitySequence 的慢步心跳只建立活动基线", () => {
+  const state = createSimulationActivityWatchdog(0);
+  const watched = observeSimulationActivityWatchdog(
+    state,
+    { heartbeat: true, activitySequence: 42 },
+    TEST_STALL_TIMEOUT_MS,
+    TEST_STALL_TIMEOUT_MS,
+  );
+
+  expect(watched.observation.status).toBe("slow-active");
+  expect(watched.observation.acceptedProgressIdleMs).toBe(TEST_STALL_TIMEOUT_MS);
+  expect(watched.observation.activityIdleMs).toBe(0);
+});
+
+test("accepted time 停滞但 activitySequence 持续增长时保持慢步运行", () => {
+  let state = createSimulationActivityWatchdog(0);
+
+  ({ state } = observeSimulationActivityWatchdog(
+    state,
+    {
+      heartbeat: true,
+      activitySequence: 1,
+      acceptedStepSequence: 10,
+      acceptedTime: 0.048,
+    },
+    100,
+    TEST_STALL_TIMEOUT_MS,
+  ));
+  let watched = observeSimulationActivityWatchdog(
+    state,
+    {
+      heartbeat: true,
+      activitySequence: 2,
+      acceptedStepSequence: 10,
+      acceptedTime: 0.048,
+    },
+    1_000,
+    TEST_STALL_TIMEOUT_MS,
+  );
+  state = watched.state;
+  expect(watched.observation.status).toBe("slow-active");
+
+  watched = observeSimulationActivityWatchdog(
+    state,
+    {
+      heartbeat: true,
+      activitySequence: 3,
+      acceptedStepSequence: 10,
+      acceptedTime: 0.048,
+    },
+    2_500,
+    TEST_STALL_TIMEOUT_MS,
+  );
+  expect(watched.observation.status).toBe("slow-active");
+  expect(watched.observation.acceptedProgressIdleMs).toBe(2_500);
+  expect(watched.observation.activityIdleMs).toBe(0);
+});
+
+test("旧后端缺少活动字段时只报告遥测不可用且不误判 stalled", () => {
+  const state = createSimulationActivityWatchdog(0);
+  const watched = observeSimulationActivityWatchdog(
+    state,
+    { heartbeat: true },
+    20_000,
+    TEST_STALL_TIMEOUT_MS,
+  );
+
+  expect(watched.observation.status).toBe("slow-telemetry-unavailable");
+  expect(watched.observation.activityIdleMs).toBeNull();
+  expect(watched.observation.activityTelemetryAvailable).toBe(false);
+});
+
+test("旧后端缺少活动字段时使用 15 分钟兼容兜底", () => {
+  const state = createSimulationActivityWatchdog(0);
+  const watched = observeSimulationActivityWatchdog(
+    state,
+    { heartbeat: true },
+    900_000,
+    TEST_STALL_TIMEOUT_MS,
+  );
+
+  expect(watched.observation.status).toBe("stalled");
+  expect(watched.observation.activityTelemetryAvailable).toBe(false);
+});
+
+test("接受步和明确可用的活动序号都长期不变时才报告 stalled", () => {
+  let state = createSimulationActivityWatchdog(0);
+  ({ state } = observeSimulationActivityWatchdog(
+    state,
+    { heartbeat: true, activitySequence: 7 },
+    0,
+    TEST_STALL_TIMEOUT_MS,
+  ));
+
+  const beforeDeadline = observeSimulationActivityWatchdog(
+    state,
+    { heartbeat: true, activitySequence: 7 },
+    999,
+    TEST_STALL_TIMEOUT_MS,
+  );
+  expect(beforeDeadline.observation.status).toBe("progressing");
+
+  const atDeadline = observeSimulationActivityWatchdog(
+    beforeDeadline.state,
+    { heartbeat: true, activitySequence: 7 },
+    1_000,
+    TEST_STALL_TIMEOUT_MS,
+  );
+  expect(atDeadline.observation.status).toBe("stalled");
+});
+
+test("heartbeat 报告新的 acceptedStepSequence 时重置接受步计时", () => {
+  let state = createSimulationActivityWatchdog(0);
+  ({ state } = observeSimulationActivityWatchdog(
+    state,
+    {
+      heartbeat: true,
+      activitySequence: 1,
+      acceptedStepSequence: 10,
+      acceptedTime: 0.048,
+    },
+    0,
+    TEST_STALL_TIMEOUT_MS,
+  ));
+
+  const watched = observeSimulationActivityWatchdog(
+    state,
+    {
+      heartbeat: true,
+      activitySequence: 2,
+      acceptedStepSequence: 11,
+      acceptedTime: 0.049,
+    },
+    5_000,
+    TEST_STALL_TIMEOUT_MS,
+  );
+  expect(watched.observation.status).toBe("progressing");
+  expect(watched.observation.acceptedProgressIdleMs).toBe(0);
+  expect(watched.state.lastAcceptedProgressAt).toBe(5_000);
+});
+
+test("validation 和 compilation 阶段不参与求解器停滞判定", () => {
+  let state = createSimulationActivityWatchdog(0);
+
+  let watched = observeSimulationActivityWatchdog(
+    state,
+    { phase: "validation", heartbeat: true },
+    90_000,
+    TEST_STALL_TIMEOUT_MS,
+  );
+  state = watched.state;
+  expect(watched.observation.status).toBe("progressing");
+  expect(watched.observation.acceptedProgressIdleMs).toBe(0);
+  expect(watched.state.integratingPhaseActive).toBe(false);
+
+  watched = observeSimulationActivityWatchdog(
+    state,
+    { phase: "compilation", heartbeat: true, activitySequence: 7 },
+    180_000,
+    TEST_STALL_TIMEOUT_MS,
+  );
+  expect(watched.observation.status).toBe("progressing");
+  expect(watched.observation.activityIdleMs).toBeNull();
+  expect(isSimulationSolverActivityPhase("compilation")).toBe(false);
+});
+
+test("进入 integrating 时重新建立计时基线", () => {
+  let state = createSimulationActivityWatchdog(0);
+  ({ state } = observeSimulationActivityWatchdog(
+    state,
+    { phase: "initialization", heartbeat: true },
+    120_000,
+    TEST_STALL_TIMEOUT_MS,
+  ));
+
+  let watched = observeSimulationActivityWatchdog(
+    state,
+    {
+      phase: "integrating",
+      heartbeat: true,
+      activitySequence: 11,
+      acceptedStepSequence: 3,
+      acceptedTime: 0.048,
+    },
+    180_000,
+    TEST_STALL_TIMEOUT_MS,
+  );
+  state = watched.state;
+  expect(watched.observation.status).toBe("progressing");
+  expect(watched.observation.acceptedProgressIdleMs).toBe(0);
+  expect(watched.observation.activityIdleMs).toBe(0);
+  expect(watched.state.integratingPhaseActive).toBe(true);
+  expect(isSimulationSolverActivityPhase("integrating")).toBe(true);
+
+  watched = observeSimulationActivityWatchdog(
+    state,
+    {
+      phase: "integrating",
+      heartbeat: true,
+      activitySequence: 11,
+      acceptedStepSequence: 3,
+      acceptedTime: 0.048,
+    },
+    181_000,
+    TEST_STALL_TIMEOUT_MS,
+  );
+  expect(watched.observation.status).toBe("stalled");
+});
+
+test("离开 integrating 后清除旧积分阶段的停滞状态", () => {
+  let state = createSimulationActivityWatchdog(0);
+  ({ state } = observeSimulationActivityWatchdog(
+    state,
+    {
+      phase: "integrating",
+      heartbeat: true,
+      activitySequence: 5,
+    },
+    0,
+    TEST_STALL_TIMEOUT_MS,
+  ));
+  ({ state } = observeSimulationActivityWatchdog(
+    state,
+    {
+      phase: "integrating",
+      heartbeat: true,
+      activitySequence: 5,
+    },
+    TEST_STALL_TIMEOUT_MS,
+    TEST_STALL_TIMEOUT_MS,
+  ));
+
+  const watched = observeSimulationActivityWatchdog(
+    state,
+    { phase: "postprocessing", heartbeat: true },
+    60_000,
+    TEST_STALL_TIMEOUT_MS,
+  );
+  expect(watched.observation.status).toBe("progressing");
+  expect(watched.observation.acceptedProgressIdleMs).toBe(0);
+  expect(watched.state.integratingPhaseActive).toBe(false);
+  expect(watched.state.lastActivitySequence).toBeNull();
+});

frontend/tests/e2e/simulation-live-mql8.spec.ts

@@ -0,0 +1,578 @@
+import { expect, test, type Page } from "@playwright/test";
+import { createHash } from "node:crypto";
+import { readFileSync, statSync, writeFileSync } from "node:fs";
+import { fileURLToPath } from "node:url";
+
+type CompactProgressEvent = {
+  receivedAtMs: number;
+  phase?: string;
+  heartbeat: boolean;
+  progress?: number;
+  simulatedTime?: number;
+  totalTime?: number;
+  activitySequence?: number;
+  activityKind?: string;
+  currentTrialTime?: number | null;
+  rhsCallCount?: number;
+  acceptedStepSequence?: number;
+  acceptedTime?: number | null;
+};
+
+type CompactResult = {
+  success?: boolean;
+  status?: string;
+  partial?: boolean;
+  simulatedUntil?: number;
+  requestedStopTime?: number;
+  sampleCount?: number;
+  timePointCount?: number;
+  finalTime?: number;
+};
+
+type BrowserStreamEvidence = {
+  lineCount: number;
+  progressEvents: CompactProgressEvent[];
+  result: CompactResult | null;
+  streamErrors: Array<{
+    receivedAtMs: number;
+    status?: number;
+    message?: string;
+    detail?: unknown;
+  }>;
+  parseErrors: string[];
+};
+
+const PROJECT_PATH = fileURLToPath(
+  new URL("../../../tests/data/test-mql-8.json", import.meta.url),
+);
+const EVIDENCE_PATH = fileURLToPath(
+  new URL(
+    "../../../tests/baselines/simulation/test_mql_8/runs/2026-08-18-production-browser-live-activity-v1-0.2.json",
+    import.meta.url,
+  ),
+);
+
+const EXPECTED_RUNTIME_ENVIRONMENT = {
+  SIMULATION_CAUSAL_EXECUTOR_V2: "1",
+  SIMULATION_CAUSAL_COORDINATE_KERNEL: "1",
+  SIMULATION_CAUSAL_DIRECT_SUM_ASSIGNMENTS: "1",
+  SIMULATION_CAUSAL_DIRECT_EQUATION_READERS: "1",
+  SIMULATION_CAUSAL_FAST_PATH: "1",
+  SIMULATION_MECHANICAL_ATOL_MODE: "legacy",
+  SIMULATION_ODE_JACOBIAN_MODE: "scipy",
+  SIMULATIONAPP_PROPERTY_CACHE: "on",
+} as const;
+
+function extractSimulationAttribute(xml: string, name: string) {
+  const match = xml.match(new RegExp(`\\b${name}="([^"]+)"`));
+  return match?.[1] ?? null;
+}
+
+function buildActivitySummary(events: CompactProgressEvent[]) {
+  const heartbeats = events.filter((event) => event.heartbeat);
+  const activityHeartbeats = heartbeats.filter(
+    (event) => typeof event.activitySequence === "number",
+  );
+  const activitySequences = activityHeartbeats.map(
+    (event) => event.activitySequence as number,
+  );
+
+  const acceptedTransitions: CompactProgressEvent[] = [];
+  let lastAcceptedStepSequence: number | undefined;
+  for (const event of events) {
+    if (
+      event.phase !== "integrating" ||
+      typeof event.acceptedStepSequence !== "number"
+    ) {
+      continue;
+    }
+    if (event.acceptedStepSequence === lastAcceptedStepSequence) {
+      continue;
+    }
+    lastAcceptedStepSequence = event.acceptedStepSequence;
+    acceptedTransitions.push(event);
+  }
+
+  let maximumAcceptedPlateau:
+    | {
+        durationMs: number;
+        fromAcceptedStepSequence?: number;
+        toAcceptedStepSequence?: number;
+        fromAcceptedTime?: number | null;
+        toAcceptedTime?: number | null;
+        heartbeatCount: number;
+        activitySequenceStart: number | null;
+        activitySequenceEnd: number | null;
+        activitySequenceAdvanced: boolean;
+      }
+    | undefined;
+  for (let index = 1; index < acceptedTransitions.length; index += 1) {
+    const previous = acceptedTransitions[index - 1];
+    const current = acceptedTransitions[index];
+    const plateauHeartbeats = activityHeartbeats.filter(
+      (event) =>
+        event.receivedAtMs >= previous.receivedAtMs &&
+        event.receivedAtMs <= current.receivedAtMs,
+    );
+    const plateauActivitySequences = plateauHeartbeats.map(
+      (event) => event.activitySequence as number,
+    );
+    const candidate = {
+      durationMs: current.receivedAtMs - previous.receivedAtMs,
+      fromAcceptedStepSequence: previous.acceptedStepSequence,
+      toAcceptedStepSequence: current.acceptedStepSequence,
+      fromAcceptedTime: previous.acceptedTime,
+      toAcceptedTime: current.acceptedTime,
+      heartbeatCount: plateauHeartbeats.length,
+      activitySequenceStart: plateauActivitySequences.at(0) ?? null,
+      activitySequenceEnd: plateauActivitySequences.at(-1) ?? null,
+      activitySequenceAdvanced:
+        plateauActivitySequences.length >= 2 &&
+        (plateauActivitySequences.at(-1) as number) >
+          (plateauActivitySequences.at(0) as number),
+    };
+    if (
+      !maximumAcceptedPlateau ||
+      candidate.durationMs > maximumAcceptedPlateau.durationMs
+    ) {
+      maximumAcceptedPlateau = candidate;
+    }
+  }
+
+  const slowRegionEvents = events.filter((event) => {
+    const reportedTimes = [
+      event.acceptedTime,
+      event.currentTrialTime,
+      event.simulatedTime,
+    ].filter((value): value is number => typeof value === "number");
+    return reportedTimes.some((value) => value >= 0.0475 && value <= 0.0505);
+  });
+
+  return {
+    progressEventCount: events.length,
+    heartbeatCount: heartbeats.length,
+    activityTelemetryHeartbeatCount: activityHeartbeats.length,
+    firstActivitySequence: activitySequences.at(0) ?? null,
+    lastActivitySequence: activitySequences.at(-1) ?? null,
+    activitySequenceAdvanced:
+      activitySequences.length >= 2 &&
+      (activitySequences.at(-1) as number) >
+        (activitySequences.at(0) as number),
+    acceptedTransitionCount: acceptedTransitions.length,
+    maximumAcceptedPlateau: maximumAcceptedPlateau ?? null,
+    slowRegionEvents,
+  };
+}
+
+async function readBrowserStreamEvidence(page: Page): Promise<BrowserStreamEvidence> {
+  return page.evaluate(() => {
+    const state = (
+      window as typeof window & { __mql8LiveStreamEvidence?: BrowserStreamEvidence }
+    ).__mql8LiveStreamEvidence;
+    return (
+      state ?? {
+        lineCount: 0,
+        progressEvents: [],
+        result: null,
+        streamErrors: [],
+        parseErrors: ["Browser stream evidence was not initialized."],
+      }
+    );
+  });
+}
+
+function emptyBrowserStreamEvidence(): BrowserStreamEvidence {
+  return {
+    lineCount: 0,
+    progressEvents: [],
+    result: null,
+    streamErrors: [],
+    parseErrors: [],
+  };
+}
+
+function retainMoreCompleteEvidence(
+  retained: BrowserStreamEvidence,
+  candidate: BrowserStreamEvidence,
+) {
+  if (
+    candidate.lineCount > retained.lineCount ||
+    (candidate.lineCount === retained.lineCount &&
+      candidate.result !== null &&
+      retained.result === null)
+  ) {
+    return candidate;
+  }
+  return retained;
+}
+
+test("test-mql-8 在真实浏览器流式链路完成 0.2 s BDF 仿真", async ({
+  page,
+}, testInfo) => {
+  const startedAt = Date.now();
+  const startedAtIso = new Date(startedAt).toISOString();
+  const cancellationRequests: string[] = [];
+  const browserConsoleErrors: string[] = [];
+  const pageErrors: string[] = [];
+  let simulationXml = "";
+  let simulationId: string | undefined;
+  let workflowCompleted = false;
+  let retainedStreamEvidence = emptyBrowserStreamEvidence();
+  let evidenceRetentionTimer: ReturnType<typeof setInterval> | undefined;
+
+  page.on("request", (request) => {
+    const url = request.url();
+    if (url.includes("/api/system-xml/simulate-stream")) {
+      simulationXml = request.postData() ?? "";
+      simulationId = request.headers()["x-simulation-id"];
+    }
+    if (/\/api\/system-xml\/simulations\/[^/]+\/cancel(?:\?|$)/.test(url)) {
+      cancellationRequests.push(url);
+    }
+  });
+  page.on("console", (message) => {
+    if (message.type() === "error") {
+      browserConsoleErrors.push(message.text());
+    }
+  });
+  page.on("pageerror", (error) => pageErrors.push(error.message));
+
+  await page.addInitScript(() => {
+    window.localStorage.clear();
+    window.sessionStorage.clear();
+    window.location.hash = "#/modeling";
+
+    const evidence: BrowserStreamEvidence = {
+      lineCount: 0,
+      progressEvents: [],
+      result: null,
+      streamErrors: [],
+      parseErrors: [],
+    };
+    (
+      window as typeof window & { __mql8LiveStreamEvidence?: BrowserStreamEvidence }
+    ).__mql8LiveStreamEvidence = evidence;
+
+    const nativeFetch = window.fetch.bind(window);
+    window.fetch = async (...args: Parameters<typeof window.fetch>) => {
+      const response = await nativeFetch(...args);
+      const input = args[0];
+      const requestUrl =
+        typeof input === "string"
+          ? input
+          : input instanceof URL
+            ? input.href
+            : input.url;
+      if (!requestUrl.includes("/api/system-xml/simulate-stream") || !response.body) {
+        return response;
+      }
+
+      const decoder = new TextDecoder();
+      let buffer = "";
+      const recordLine = (line: string) => {
+        const trimmed = line.trim();
+        if (!trimmed) {
+          return;
+        }
+        evidence.lineCount += 1;
+        try {
+          const parsed = JSON.parse(trimmed) as Record<string, unknown>;
+          const receivedAtMs = performance.now();
+          if (parsed.event === "progress") {
+            evidence.progressEvents.push({
+              receivedAtMs,
+              phase: typeof parsed.phase === "string" ? parsed.phase : undefined,
+              heartbeat: parsed.heartbeat === true,
+              progress:
+                typeof parsed.progress === "number" ? parsed.progress : undefined,
+              simulatedTime:
+                typeof parsed.simulatedTime === "number"
+                  ? parsed.simulatedTime
+                  : undefined,
+              totalTime:
+                typeof parsed.totalTime === "number" ? parsed.totalTime : undefined,
+              activitySequence:
+                typeof parsed.activitySequence === "number"
+                  ? parsed.activitySequence
+                  : undefined,
+              activityKind:
+                typeof parsed.activityKind === "string"
+                  ? parsed.activityKind
+                  : undefined,
+              currentTrialTime:
+                typeof parsed.currentTrialTime === "number" ||
+                parsed.currentTrialTime === null
+                  ? parsed.currentTrialTime
+                  : undefined,
+              rhsCallCount:
+                typeof parsed.rhsCallCount === "number"
+                  ? parsed.rhsCallCount
+                  : undefined,
+              acceptedStepSequence:
+                typeof parsed.acceptedStepSequence === "number"
+                  ? parsed.acceptedStepSequence
+                  : undefined,
+              acceptedTime:
+                typeof parsed.acceptedTime === "number" || parsed.acceptedTime === null
+                  ? parsed.acceptedTime
+                  : undefined,
+            });
+          } else if (parsed.event === "result") {
+            const result = parsed.result as Record<string, unknown> | undefined;
+            const diagnostics = result?.diagnostics as
+              | Record<string, unknown>
+              | undefined;
+            const series = result?.series as Record<string, unknown> | undefined;
+            const times = Array.isArray(series?.time)
+              ? (series.time as unknown[]).filter(
+                  (value): value is number => typeof value === "number",
+                )
+              : [];
+            evidence.result = {
+              success:
+                typeof result?.success === "boolean" ? result.success : undefined,
+              status: typeof result?.status === "string" ? result.status : undefined,
+              partial:
+                typeof result?.partial === "boolean" ? result.partial : undefined,
+              simulatedUntil:
+                typeof result?.simulatedUntil === "number"
+                  ? result.simulatedUntil
+                  : undefined,
+              requestedStopTime:
+                typeof result?.requestedStopTime === "number"
+                  ? result.requestedStopTime
+                  : undefined,
+              sampleCount:
+                typeof diagnostics?.sampleCount === "number"
+                  ? diagnostics.sampleCount
+                  : undefined,
+              timePointCount: times.length,
+              finalTime: times.at(-1),
+            };
+          } else if (parsed.event === "error") {
+            evidence.streamErrors.push({
+              receivedAtMs,
+              status: typeof parsed.status === "number" ? parsed.status : undefined,
+              message:
+                typeof parsed.message === "string" ? parsed.message : undefined,
+              detail: parsed.detail,
+            });
+          }
+        } catch (error) {
+          evidence.parseErrors.push(
+            error instanceof Error ? error.message : String(error),
+          );
+        }
+      };
+      const flushLines = () => {
+        let newlineIndex = buffer.indexOf("\n");
+        while (newlineIndex >= 0) {
+          recordLine(buffer.slice(0, newlineIndex));
+          buffer = buffer.slice(newlineIndex + 1);
+          newlineIndex = buffer.indexOf("\n");
+        }
+      };
+      const monitoredBody = response.body.pipeThrough(
+        new TransformStream<Uint8Array, Uint8Array>({
+          transform(chunk, controller) {
+            buffer += decoder.decode(chunk, { stream: true });
+            flushLines();
+            controller.enqueue(chunk);
+          },
+          flush() {
+            buffer += decoder.decode();
+            flushLines();
+            recordLine(buffer);
+            buffer = "";
+          },
+        }),
+      );
+      return new Response(monitoredBody, {
+        status: response.status,
+        statusText: response.statusText,
+        headers: response.headers,
+      });
+    };
+  });
+
+  const retainCurrentStreamEvidence = async () => {
+    const candidate = await readBrowserStreamEvidence(page);
+    retainedStreamEvidence = retainMoreCompleteEvidence(
+      retainedStreamEvidence,
+      candidate,
+    );
+  };
+  evidenceRetentionTimer = setInterval(() => {
+    void retainCurrentStreamEvidence().catch(() => undefined);
+  }, 1_000);
+
+  try {
+    await page.goto("/");
+    await expect(page.locator(".catalog-source.ready")).toBeVisible({
+      timeout: 30_000,
+    });
+
+    await page.locator('input[type="file"]').setInputFiles(PROJECT_PATH);
+    const consolePanel = page.getByRole("complementary", {
+      name: "仿真控制台",
+      exact: true,
+    });
+    const consoleSummary = consolePanel.locator(
+      ".simulation-console-dock-summary",
+    );
+    await expect(consoleSummary).toContainText(
+      "已导入工程：test-mql-8.json",
+      { timeout: 30_000 },
+    );
+
+    const stopTimeInput = page.getByLabel("结束时间", { exact: true });
+    await stopTimeInput.fill("0.2");
+    await stopTimeInput.press("Enter");
+    await expect(stopTimeInput).toHaveValue("0.2");
+    await expect(page.getByLabel("采样步长", { exact: true })).toHaveValue(
+      "0.01",
+    );
+    await expect(
+      page.getByLabel("最大积分步长", { exact: true }),
+    ).toHaveValue("0.001");
+    await expect(page.getByLabel("求解器", { exact: true })).toHaveValue("BDF");
+
+    await page.getByRole("button", { name: "运行仿真", exact: true }).click();
+    await expect.poll(() => simulationXml.length, { timeout: 60_000 }).toBeGreaterThan(0);
+    expect(extractSimulationAttribute(simulationXml, "tStop")).toBe("0.2");
+    expect(extractSimulationAttribute(simulationXml, "sampleStep")).toBe("0.01");
+    expect(extractSimulationAttribute(simulationXml, "maxStep")).toBe("0.001");
+    expect(extractSimulationAttribute(simulationXml, "method")).toBe("BDF");
+
+    await expect(consoleSummary).toContainText(
+      "仿真完成，已生成新的结果，共 21 个采样点",
+      { timeout: 480_000 },
+    );
+    await expect
+      .poll(async () => (await readBrowserStreamEvidence(page)).result?.status, {
+        timeout: 30_000,
+      })
+      .toBe("completed");
+
+    const streamEvidence = await readBrowserStreamEvidence(page);
+    expect(streamEvidence.parseErrors).toEqual([]);
+    expect(streamEvidence.streamErrors).toEqual([]);
+    expect(streamEvidence.result).toMatchObject({
+      success: true,
+      status: "completed",
+      partial: false,
+      simulatedUntil: 0.2,
+      requestedStopTime: 0.2,
+      sampleCount: 21,
+      timePointCount: 21,
+      finalTime: 0.2,
+    });
+    const activitySummary = buildActivitySummary(streamEvidence.progressEvents);
+    expect(activitySummary.heartbeatCount).toBeGreaterThan(0);
+    expect(activitySummary.activityTelemetryHeartbeatCount).toBeGreaterThan(1);
+    expect(activitySummary.activitySequenceAdvanced).toBe(true);
+    expect(cancellationRequests).toEqual([]);
+    expect(pageErrors).toEqual([]);
+
+    await page.getByRole("button", { name: "展开仿真控制台" }).click();
+    const consoleLog = consolePanel.getByRole("region", { name: "控制台日志" });
+    await expect(consoleLog).toContainText(
+      "仿真完成，已生成新的结果，共 21 个采样点",
+    );
+    await expect(consoleLog).not.toContainText("仿真失败");
+    await expect(consoleLog).not.toContainText("仿真因进度异常而终止");
+
+    if (
+      activitySummary.maximumAcceptedPlateau &&
+      activitySummary.maximumAcceptedPlateau.durationMs >= 60_000
+    ) {
+      expect(
+        activitySummary.maximumAcceptedPlateau.activitySequenceAdvanced,
+      ).toBe(true);
+      await expect(consoleLog).toContainText("后端内部活动仍在推进");
+    }
+    workflowCompleted = true;
+  } finally {
+    if (evidenceRetentionTimer !== undefined) {
+      clearInterval(evidenceRetentionTimer);
+    }
+    await retainCurrentStreamEvidence().catch(() => undefined);
+    const streamEvidence = retainedStreamEvidence;
+    const activitySummary = buildActivitySummary(streamEvidence.progressEvents);
+    const finishedAt = Date.now();
+    const projectBytes = readFileSync(PROJECT_PATH);
+    const evidence = {
+      schemaVersion: 1,
+      kind: "live-browser-stream-verification",
+      generatedAt: new Date(finishedAt).toISOString(),
+      startedAt: startedAtIso,
+      wallSeconds: (finishedAt - startedAt) / 1_000,
+      workflowCompleted,
+      topology: {
+        browserOrigin: "http://127.0.0.1:14173",
+        backendOrigin: "http://127.0.0.1:18181",
+        servingMode: "isolated-vite-dev-proxy",
+      },
+      source: {
+        path: "tests/data/test-mql-8.json",
+        bytes: statSync(PROJECT_PATH).size,
+        sha256: createHash("sha256").update(projectBytes).digest("hex"),
+      },
+      target: {
+        tStart: 0,
+        tStop: 0.2,
+        sampleStep: 0.01,
+        maxStep: 0.001,
+        method: "BDF",
+      },
+      runtimeEnvironment: EXPECTED_RUNTIME_ENVIRONMENT,
+      request: {
+        simulationId: simulationId ?? null,
+        xmlBytes: Buffer.byteLength(simulationXml),
+        simulationAttributes: {
+          tStart: extractSimulationAttribute(simulationXml, "tStart"),
+          tStop: extractSimulationAttribute(simulationXml, "tStop"),
+          sampleStep: extractSimulationAttribute(simulationXml, "sampleStep"),
+          maxStep: extractSimulationAttribute(simulationXml, "maxStep"),
+          method: extractSimulationAttribute(simulationXml, "method"),
+        },
+      },
+      ndjson: {
+        lineCount: streamEvidence.lineCount,
+        parseErrors: streamEvidence.parseErrors,
+        streamErrors: streamEvidence.streamErrors,
+        result: streamEvidence.result,
+        activity: activitySummary,
+      },
+      browser: {
+        cancellationRequests,
+        pageErrors,
+        consoleErrors: browserConsoleErrors,
+      },
+      acceptance: {
+        completedWith21Samples:
+          workflowCompleted &&
+          streamEvidence.result?.status === "completed" &&
+          streamEvidence.result?.sampleCount === 21 &&
+          streamEvidence.result?.timePointCount === 21,
+        noCancellationRequest: cancellationRequests.length === 0,
+        noStreamError: streamEvidence.streamErrors.length === 0,
+        noPageError: pageErrors.length === 0,
+        activityTelemetryAdvanced: activitySummary.activitySequenceAdvanced,
+      },
+    };
+    const serializedEvidence = `${JSON.stringify(evidence, null, 2)}\n`;
+    writeFileSync(EVIDENCE_PATH, serializedEvidence, "utf8");
+    await testInfo.attach("mql8-live-browser-evidence", {
+      body: Buffer.from(serializedEvidence),
+      contentType: "application/json",
+    });
+    const screenshot = await page.screenshot({ fullPage: true }).catch(() => null);
+    if (screenshot) {
+      await testInfo.attach("mql8-live-browser-final-page", {
+        body: screenshot,
+        contentType: "image/png",
+      });
+    }
+  }
+});

frontend/tests/e2e/simulation-timeout.spec.ts

@@ -1,8 +1,11 @@
 import { expect, test } from "@playwright/test";
 
 import {
+  SIMULATION_ACTIVITY_STALL_TIMEOUT_MS,
+  SIMULATION_ACTIVITY_STALL_TIMEOUT_SECONDS,
   SIMULATION_SOLVER_STALL_TIMEOUT_MINUTES,
   SIMULATION_SOLVER_STALL_TIMEOUT_MS,
+  solverActivityStallTimeoutMessage,
   solverStallTimeoutMessage,
   solverStallTimeoutReached,
 } from "../../src/simulationTimeout";
@@ -19,3 +22,11 @@ test("solver stall messages use the configured duration", () => {
   expect(solverStallTimeoutMessage("recovering")).toContain("连续 15 分钟");
   expect(solverStallTimeoutMessage("recovering")).toContain("恢复部分结果");
 });
+
+test("activity-aware watchdog keeps its shorter true-stall threshold", () => {
+  expect(SIMULATION_ACTIVITY_STALL_TIMEOUT_SECONDS).toBe(60);
+  expect(SIMULATION_ACTIVITY_STALL_TIMEOUT_MS).toBe(60_000);
+  expect(solverActivityStallTimeoutMessage("detected")).toContain(
+    "接受步和内部活动均连续 60 秒",
+  );
+});