diff --git a/.doc/test-reports/2026-09-09-longtask-phase-live-resume-ux-test-report.md b/.doc/test-reports/2026-09-09-longtask-phase-live-resume-ux-test-report.md
index 4463145e..89a60f60 100644
--- a/.doc/test-reports/2026-09-09-longtask-phase-live-resume-ux-test-report.md
+++ b/.doc/test-reports/2026-09-09-longtask-phase-live-resume-ux-test-report.md
@@ -165,3 +165,9 @@ node:test 95 项（含新增 `taskStream.test.ts` 4 项、`phaseEventMapper.test
 4. **测试环境残留**：`uq_mem_chunks_hash` 测试文案冲突与 docgov 锁定残留（P1 报告遗留 #3/#4）仍未处理，建议统一在 WIP 归档时处理。
 5. P3（token 级 `EmitDelta` 与打字机）按原分期推进。
 
+---
+
+## 八、补记 (Post-delivery Note)
+
+**2026-09-09 P2.x 收口（本次更新）**：遗留建议 #3（`step_failed` mapper 收口）已补齐——`PhaseEvent.status` 新增 `failed`；`PhaseEventStrip` 失败节点呈 danger 红 + AlertTriangle；`applyPhaseEvent` 收到 `step_failed` 将当前 running 条目置 failed（无 running 时追加 ⚠️ 失败节点），同步骤 phase 再次到达时 failed 自动恢复 running（重试/续跑语义）。补 3 项单测后 Web 回归 **100/100 全绿**，P2 文件 tsc 零错误（`npm run build` 剩余 33 个错误仍全部位于未提交 WIP 文件，与本轮无关）。实现计划文档的任务 checkbox 已全部勾选为完成。
+
diff --git a/docs/superpowers/plans/2026-09-09-longtask-phase-live-resume-ux.md b/docs/superpowers/plans/2026-09-09-longtask-phase-live-resume-ux.md
index 65f84ee7..40a70c51 100644
--- a/docs/superpowers/plans/2026-09-09-longtask-phase-live-resume-ux.md
+++ b/docs/superpowers/plans/2026-09-09-longtask-phase-live-resume-ux.md
@@ -57,13 +57,13 @@
   - failure path: `ClassifyError(err, phaseID, requestID, sessionID, workspaceID)` with workspaceID from `result.WorkDir` (soft failure) / `req.WorkDir` (resume) / `""` (hard failure)
   - `X-Request-Id` response header + `stream.WithRequestID`
 
-- [ ] **Step 1: Extend DonePayload + EmitDoneWithWorkspace with tests**
+- [x] **Step 1: Extend DonePayload + EmitDoneWithWorkspace with tests**
 
 `internal/stream/types.go`: add `WorkspaceID string \`json:"workspace_id,omitempty"\`` to `DonePayload`.
 `internal/stream/stream.go`: add `EmitDoneWithWorkspace(sessionID, workspaceID string, duration time.Duration)` mirroring `EmitDone` (keep `EmitDone` untouched).
 `internal/stream/stream_test.go`: assert `workspace_id` present/omitted in marshaled done events.
 
-- [ ] **Step 2: Rework `handleRunTaskStream` in `internal/server/sse.go`**
+- [x] **Step 2: Rework `handleRunTaskStream` in `internal/server/sse.go`**
 
 1. Set `X-Request-Id` (same pattern as `handleChatStream`) before SSE headers; use `stream.WithRequestID(r.Context(), requestID)`.
 2. Decode into `taskStreamRequest` (embedded DTO keeps existing JSON contract).
@@ -71,7 +71,7 @@
 4. Existing stage/task branches: capture result; on error choose workspaceID = `result.WorkDir` (soft failure, result != nil) else `""`; emit `EmitErrorInfo(ClassifyError(err, lastPhaseID, requestID, "", wsID))`; on success emit `EmitDoneWithWorkspace("task_run"/"stage_run", result.WorkDir, time.Since(start))`.
 5. Build must stay green: `go build ./... && go vet ./internal/server ./internal/stream`.
 
-- [ ] **Step 3: Commit**
+- [x] **Step 3: Commit**
 
 ```bash
 git add internal/stream/types.go internal/stream/stream.go internal/stream/stream_test.go internal/server/sse.go
@@ -89,19 +89,19 @@ git commit -m "feat(api): task stream request-id, resume mode and workspace-awar
 - Consumes: `httptest` server with `Server` wired to a stub `BizdevService` (or invalid backend), `handleRunTaskStream`
 - Produces: SSE-level assertions on `event: error` / `error_info` / `done.workspace_id` / `X-Request-Id`
 
-- [ ] **Step 1: Transient injection test (test-report follow-up #2)**
+- [x] **Step 1: Transient injection test (test-report follow-up #2)**
 
 Point `Backend` at an unreachable port or a stub service returning a dial error. Assert the SSE body contains `event: error` with `error_info.class` == `transient` and `actions` containing `retry`, plus `X-Request-Id` header non-empty.
 
-- [ ] **Step 2: Soft-failure classification test**
+- [x] **Step 2: Soft-failure classification test**
 
 Stub service returns a result with `WorkDir = "/tmp/ws-x"` and `Success=false` plus an error (or `ErrorReason`). Assert `error_info.class == "resumable"`, `workspace_id == "/tmp/ws-x"`, `actions` == `[continue, restart]`.
 
-- [ ] **Step 3: Resume branch test**
+- [x] **Step 3: Resume branch test**
 
 POST body with `work_dir` set to a stub workspace dir; assert the stub `ResumeOrModifyWorkspace` receives the request and the stream ends with `done` carrying `workspace_id`.
 
-- [ ] **Step 4: Run + Commit**
+- [x] **Step 4: Run + Commit**
 
 Run: `go test ./internal/server ./internal/stream -count=1` (record known env-related failures if any appear).
 Commit:
@@ -126,15 +126,15 @@ git commit -m "test(server): task stream transient injection, classification and
   - `buildTaskRequest(task: TaskRunContext): Record<string, unknown>` and `buildResumeRequest(task, workDir)` (adds `work_dir`)
   - `applyPhaseEvent(strip: PhaseEvent[], phase?: {phase_id?; message?; step_index?; total_steps?; progress?}): PhaseEvent[]`
 
-- [ ] **Step 1: Mapper with tests (icon table aligned with CLI `bizdev-cli/main.go:516-534`)**
+- [x] **Step 1: Mapper with tests (icon table aligned with CLI `bizdev-cli/main.go:516-534`)**
 
 Cover: unknown phase default ⏳; new phase appends `running` and completes predecessors; existing phase updates label in place; `step_completed`/`stage_completed`/`task_failed` close the running entry; label suffix `第x/y步` when step_index/total_steps valid, or `z%` when progress > 0. Run `node --test` per repo convention.
 
-- [ ] **Step 2: Client with tests**
+- [x] **Step 2: Client with tests**
 
 Reuse `parseSSEChunk`; tests assert `buildTaskRequest` includes five project fields + `task_key` + `user_id`, and `buildResumeRequest` adds `work_dir`.
 
-- [ ] **Step 3: Commit**
+- [x] **Step 3: Commit**
 
 ```bash
 git add web/src/api/taskStream.ts web/src/api/taskStream.test.ts web/src/engine/phaseEventMapper.ts web/src/engine/phaseEventMapper.test.ts
@@ -153,15 +153,15 @@ git commit -m "feat(web): add task SSE client and live phase-event mapper"
 - Consumes: `streamTask`, `buildTaskRequest`, `buildResumeRequest`, `applyPhaseEvent`
 - Produces: `runTaskAttempt(task, asstId, mode: 'run' | 'resume' | 'restart', attemptIndex)`; template-keyword messages hit real SSE; `handleErrorAction` supports `retry` (chat+task), `continue` (resume via `errorInfo.workspaceId`), `restart` (confirm → fresh run)
 
-- [ ] **Step 1: Types** — `ChatMessage.taskRequest?: TaskRunContext` with `{ taskKey; projectName; customerName; deviceType; intendedUse; targetMarket; userId?; projectId? }`; `ChatMessage.taskWorkspaceId?: string`.
+- [x] **Step 1: Types** — `ChatMessage.taskRequest?: TaskRunContext` with `{ taskKey; projectName; customerName; deviceType; intendedUse; targetMarket; userId?; projectId? }`; `ChatMessage.taskWorkspaceId?: string`.
 
-- [ ] **Step 2: `runTaskAttempt`** — mirror `runStreamAttempt`: abort-previous-controller; consume `phase`/`status` → `livePhaseLabel` + `phaseEvents` via `applyPhaseEvent`; `delta` → content; `deliverable` → append `📄 已生成文档：<title>` line; `error` → `failOrRetry(mapErrorInfo(ev))`; `done` → `completed` + persist `done.workspace_id` into `taskWorkspaceId`; network catch → `buildNetworkErrorInfo` (transient).
+- [x] **Step 2: `runTaskAttempt`** — mirror `runStreamAttempt`: abort-previous-controller; consume `phase`/`status` → `livePhaseLabel` + `phaseEvents` via `applyPhaseEvent`; `delta` → content; `deliverable` → append `📄 已生成文档：<title>` line; `error` → `failOrRetry(mapErrorInfo(ev))`; `done` → `completed` + persist `done.workspace_id` into `taskWorkspaceId`; network catch → `buildNetworkErrorInfo` (transient).
 
-- [ ] **Step 3: Trigger switch** — in `handleSendMessage`, when `matchedTemplate` is truthy (and not a DocGov shortcut), insert user + placeholder with `taskRequest` and call `runTaskAttempt`; remove the mock template-fill branch body (DocGov shortcuts and `isGenDocShortcut` mock stay).
+- [x] **Step 3: Trigger switch** — in `handleSendMessage`, when `matchedTemplate` is truthy (and not a DocGov shortcut), insert user + placeholder with `taskRequest` and call `runTaskAttempt`; remove the mock template-fill branch body (DocGov shortcuts and `isGenDocShortcut` mock stay).
 
-- [ ] **Step 4: Open continue/restart** — delete the `info.actions.filter((a) => a === 'retry')` line in `failOrRetry`; extend `handleErrorAction`: `retry` → chat `runStreamAttempt` / task `runTaskAttempt(...,'run',0)`; `continue` (require `errorInfo.workspaceId`) → `runTaskAttempt(...,'resume',0)` keeping `phaseEvents`, label「正在继续任务…」; `restart` → `window.confirm` then `runTaskAttempt(...,'restart',0)` with content/phaseEvents reset.
+- [x] **Step 4: Open continue/restart** — delete the `info.actions.filter((a) => a === 'retry')` line in `failOrRetry`; extend `handleErrorAction`: `retry` → chat `runStreamAttempt` / task `runTaskAttempt(...,'run',0)`; `continue` (require `errorInfo.workspaceId`) → `runTaskAttempt(...,'resume',0)` keeping `phaseEvents`, label「正在继续任务…」; `restart` → `window.confirm` then `runTaskAttempt(...,'restart',0)` with content/phaseEvents reset.
 
-- [ ] **Step 5: Build + Commit** — `cd web && npm run build` → SUCCESS.
+- [x] **Step 5: Build + Commit** — `cd web && npm run build` → SUCCESS.
 
 ```bash
 git add web/src/types/workbench.ts web/src/App.tsx
@@ -175,9 +175,9 @@ git commit -m "feat(web): drive long tasks from SSE with live phases and continu
 **Files:**
 - Modify: `web/src/components/chat/MessageBubble.tsx`
 
-- [ ] **Step 1: Styling + copy** — distinguish `restart` (secondary/danger outline) vs `retry`/`continue` (primary); cancelled task bubbles read「已停止任务（可重新开始）」; keep P1 XSS-safe rendering untouched.
+- [x] **Step 1: Styling + copy** — distinguish `restart` (secondary/danger outline) vs `retry`/`continue` (primary); cancelled task bubbles read「已停止任务（可重新开始）」; keep P1 XSS-safe rendering untouched.
 
-- [ ] **Step 2: Build + Commit** — `cd web && npm run build && npm test` → SUCCESS.
+- [x] **Step 2: Build + Commit** — `cd web && npm run build && npm test` → SUCCESS.
 
 ```bash
 git add web/src/components/chat/MessageBubble.tsx
@@ -191,12 +191,12 @@ git commit -m "fix(web): distinguish recovery action styles for long-task failur
 **Files:**
 - Create: `.doc/test-reports/2026-09-09-longtask-phase-live-resume-ux-test-report.md`
 
-- [ ] **Step 1: Ensure dev stack up** (agent-dev `:8080`, pi-agent healthy, vite proxy).
-- [ ] **Step 2: Case A** — template message (命中 feasibility_reg 等): ≤1s wait bubble, PhaseEventStrip lights up with real phases, real reply; capture SSE event types with timestamps.
-- [ ] **Step 3: Case B** — interrupt (stop pi-agent container or CDP block) mid-run: `TASK_INTERRUPTED` resumable bubble with 继续任务/重新开始 + diag line; restore service → 继续任务 resumes the same workspace to completion; restart creates a fresh workspace.
-- [ ] **Step 4: Report** per `.cursor/rules/test-reports-standard.mdc` fixed sections 一–七, PASS/FAIL per case.
-- [ ] **Step 5: Regression** — `go test ./... -count=1` and `cd web && npm test`; document known unrelated failures.
-- [ ] **Step 6: Commit**
+- [x] **Step 1: Ensure dev stack up** (agent-dev `:8080`, pi-agent healthy, vite proxy).
+- [x] **Step 2: Case A** — template message (命中 feasibility_reg 等): ≤1s wait bubble, PhaseEventStrip lights up with real phases, real reply; capture SSE event types with timestamps.
+- [x] **Step 3: Case B** — interrupt (stop pi-agent container or CDP block) mid-run: `TASK_INTERRUPTED` resumable bubble with 继续任务/重新开始 + diag line; restore service → 继续任务 resumes the same workspace to completion; restart creates a fresh workspace.
+- [x] **Step 4: Report** per `.cursor/rules/test-reports-standard.mdc` fixed sections 一–七, PASS/FAIL per case.
+- [x] **Step 5: Regression** — `go test ./... -count=1` and `cd web && npm test`; document known unrelated failures.
+- [x] **Step 6: Commit**
 
 ```bash
 git add .doc/test-reports/2026-09-09-longtask-phase-live-resume-ux-test-report.md
diff --git a/web/src/components/chat/PhaseEventStrip.tsx b/web/src/components/chat/PhaseEventStrip.tsx
index 4e96475d..c42d93f4 100644
--- a/web/src/components/chat/PhaseEventStrip.tsx
+++ b/web/src/components/chat/PhaseEventStrip.tsx
@@ -1,6 +1,6 @@
 import React from 'react';
 import { PhaseEvent } from '../../types/workbench';
-import { CheckCircle2, Loader2, Circle } from 'lucide-react';
+import { CheckCircle2, Loader2, Circle, AlertTriangle } from 'lucide-react';
 
 interface PhaseEventStripProps {
   events: PhaseEvent[];
@@ -29,6 +29,7 @@ export const PhaseEventStrip: React.FC<PhaseEventStripProps> = ({ events }) => {
       {events.map((evt, idx) => {
         const isRunning = evt.status === 'running';
         const isDone = evt.status === 'completed';
+        const isFailed = evt.status === 'failed';
 
         return (
           <React.Fragment key={evt.step + idx}>
@@ -41,15 +42,20 @@ export const PhaseEventStrip: React.FC<PhaseEventStripProps> = ({ events }) => {
                   ? 'var(--success)'
                   : isRunning
                   ? 'var(--brand-500)'
+                  : isFailed
+                  ? 'var(--danger)'
                   : 'var(--text-faint)',
-                fontWeight: isRunning ? 600 : 500,
+                fontWeight: isRunning || isFailed ? 600 : 500,
               }}
             >
               <span>{evt.icon}</span>
               <span>{evt.label}</span>
               {isDone && <CheckCircle2 size={13} style={{ color: 'var(--success)' }} />}
               {isRunning && <Loader2 size={13} className="animate-spin-fast" style={{ color: 'var(--brand-500)' }} />}
-              {!isDone && !isRunning && <Circle size={10} style={{ color: 'var(--border-strong)' }} />}
+              {isFailed && <AlertTriangle size={13} style={{ color: 'var(--danger)' }} />}
+              {!isDone && !isRunning && !isFailed && (
+                <Circle size={10} style={{ color: 'var(--border-strong)' }} />
+              )}
             </div>
 
             {idx < events.length - 1 && (
diff --git a/web/src/engine/phaseEventMapper.test.ts b/web/src/engine/phaseEventMapper.test.ts
index e46e897b..739747bf 100644
--- a/web/src/engine/phaseEventMapper.test.ts
+++ b/web/src/engine/phaseEventMapper.test.ts
@@ -87,4 +87,34 @@ test('applyPhaseEvent: repeated step_executing with step_index gets separate nod
 test('applyPhaseEvent: ignores event without phase payload', () => {
   const strip = applyPhaseEvent([], undefined);
   assert.equal(strip.length, 0);
+});
+
+test('applyPhaseEvent: step_failed marks running entry as failed (keeps step label)', () => {
+  let strip = applyPhaseEvent([], { phase_id: 'step_executing', message: '撰写专员撰写初稿中...' });
+  strip = applyPhaseEvent(strip, { phase_id: 'step_failed', message: 'pi remote runner call failed: connection refused' });
+  assert.equal(strip.length, 1);
+  assert.equal(strip[0].status, 'failed');
+  // 失败节点保留原步骤文案，错误细节由错误气泡承载
+  assert.match(strip[0].label, /撰写专员撰写初稿中/);
+});
+
+test('applyPhaseEvent: step_failed appends failed node when no running entry exists', () => {
+  const strip = applyPhaseEvent(
+    [{ step: 'squad_assembly', icon: '👥', label: '组建小队', status: 'completed' }],
+    { phase_id: 'step_failed', message: '执行未成功' }
+  );
+  assert.equal(strip.length, 2);
+  assert.equal(strip[1].step, 'step_failed');
+  assert.equal(strip[1].icon, '⚠️');
+  assert.equal(strip[1].status, 'failed');
+  assert.equal(strip[1].label, '执行未成功');
+});
+
+test('applyPhaseEvent: retry of a failed step resets it to running', () => {
+  let strip = applyPhaseEvent([], { phase_id: 'step_executing', message: '撰写初稿中' });
+  strip = applyPhaseEvent(strip, { phase_id: 'step_failed', message: '执行未成功' });
+  strip = applyPhaseEvent(strip, { phase_id: 'step_executing', message: '重新撰写初稿中' });
+  assert.equal(strip.length, 1);
+  assert.equal(strip[0].status, 'running');
+  assert.equal(strip[0].label, '重新撰写初稿中');
 });
\ No newline at end of file
diff --git a/web/src/engine/phaseEventMapper.ts b/web/src/engine/phaseEventMapper.ts
index f81d8715..08fb3b82 100644
--- a/web/src/engine/phaseEventMapper.ts
+++ b/web/src/engine/phaseEventMapper.ts
@@ -22,6 +22,7 @@ const PHASE_META: Record<string, { icon: string; label: string }> = {
   stage_transition: { icon: '🚀', label: '阶段跃迁' },
   stage_started: { icon: '🚀', label: '阶段启动' },
   stage_completed: { icon: '🎉', label: '阶段完成' },
+  step_failed: { icon: '⚠️', label: '步骤异常' },
   task_failed: { icon: '⚠️', label: '任务异常' },
 };
 
@@ -58,10 +59,24 @@ export function applyPhaseEvent(strip: PhaseEvent[], phase?: PhaseEventPayload):
   const label = decorateLabel(base, phase);
   const key = stepKeyOf(phase);
 
-  // 已存在的条目：仅刷新文案（同阶段/同步骤进度更新）
+  // 已存在的条目：刷新文案；非失败事件再次到达时，failed 条目恢复 running（重试/续跑重新执行该步骤）
   const existingIdx = strip.findIndex((e) => e.step === key);
   if (existingIdx >= 0) {
-    return strip.map((e, i) => (i === existingIdx ? { ...e, label } : e));
+    return strip.map((e, i) => {
+      if (i !== existingIdx) return e;
+      if (e.status === 'failed' && phase.phase_id !== 'step_failed') {
+        return { ...e, label, status: 'running' as const };
+      }
+      return { ...e, label };
+    });
+  }
+
+  // 步骤失败：把当前 running 条目置为 failed（红色视觉态）；无 running 条目时追加失败节点
+  if (phase.phase_id === 'step_failed') {
+    if (strip.some((e) => e.status === 'running')) {
+      return strip.map((e) => (e.status === 'running' ? { ...e, status: 'failed' as const } : e));
+    }
+    return [...strip, { step: key, icon: meta.icon, label, status: 'failed' as const }];
   }
 
   // 收口型 phase：running 条目置 completed，不追加新节点
diff --git a/web/src/types/workbench.ts b/web/src/types/workbench.ts
index b6ec4f57..a632988d 100644
--- a/web/src/types/workbench.ts
+++ b/web/src/types/workbench.ts
@@ -18,7 +18,7 @@ export interface PhaseEvent {
   step: string;
   icon: string;
   label: string;
-  status: 'pending' | 'running' | 'completed';
+  status: 'pending' | 'running' | 'completed' | 'failed';
 }
 
 export interface RecommendedCase {