docs(test): record pi-agent E2E failure at V0.1 stage timeout.

Document 33min run with dialogue steps passing and workflow ExecuteStage failing on pi-agent /v1/run deadline.

Co-authored-by: Cursor <cursoragent@cursor.com>

.doc/test-reports/2026-09-12-pg-ci-soak-e2e-test-report.md

@@ -53,8 +53,14 @@ QA-001 落地后，`go test -short ./...` 仍存在 PG 集成失败（`zhanggong
 ### T4：Pi-Agent 全链路 E2E
 
 - **Input**：`go test -timeout 1h -run TestPiAgent_FullLifecycle ./internal/server/...`
-- **Actual Output**：运行中（~25min+，未加 `-v` 日志缓冲；pi-agent @18865 在线）
-- **Verdict**：**PENDING**
+- **Actual Output**（耗时 **1980s / ~33min**）：
+  ```
+  ✓ 步骤 0 Health + 步骤 1 张工对话/法规咨询 PASS（~3min）
+  ✗ 步骤 2 ExecuteStage V0.1 FAIL:
+    pi remote runner call failed: Post "http://127.0.0.1:18865/v1/run": context deadline exceeded
+  --- FAIL: TestPiAgent_FullLifecycle_MultiRole_RealWorld_E2E (1980.22s)
+  ```
+- **Verdict**：**FAIL**（工作流阶段 pi-agent `/v1/run` 调用超时，非 stub 对话路径）
 
 ### T7：Test 环境冷启动 + soak