diff --git a/.scratch/v111-architecture-scan.md b/.scratch/v111-architecture-scan.md
index 22199d1..520375a 100644
--- a/.scratch/v111-architecture-scan.md
+++ b/.scratch/v111-architecture-scan.md
@@ -113,6 +113,34 @@ except Exception as e:
 
 **当前状态**：两个 xfail 守卫在 `test_openclaw_client_and_webhook.py`，CI 不阻塞；修复后移除 xfail 即转绿。
 
+### 6.3 前端 CronPoolMonitor 不响应 visibilitychange（S6 缺口，T2 暴露）
+
+**症状**：`frontend/web/src/pages/CronPoolMonitor.test.tsx` 的 `it.fails('listens to visibilitychange ...')`。
+CronPoolMonitor 当前的 `useEffect` 只做了 `setInterval(loadData, 5000)` + `clearInterval` 清理，不监听 `document.visibilitychange`。
+
+**影响**：当浏览器标签页被切换到后台或最小化时，仍每 5 秒轮询后端 `/api/openclaw/cron-pool/*` —— 浪费网络/CPU，且与 `useIntelligentEvalRead` 的"终态停轮询"行为漂移。
+
+**修复方向**（待开独立 issue，不在 #6 范围）：
+- 在 `useEffect` 里 `document.addEventListener('visibilitychange', ...)`；`hidden` 时清除 timer 并清掉 `interval` 引用，`visible` 时立即 `loadData()` 并重建 interval；cleanup 同时 `removeEventListener`。
+- 或抽统一 `usePolling(loader, { intervalMs, pauseWhenHidden })` hook 让智能评估读模型与 Cron 池共用。
+
+**当前状态**：`it.fails` 守卫在 `CronPoolMonitor.test.tsx`，CI 显示 `1 expected fail`（vitest 等价 xfail），不阻塞；修复后移除 `it.fails` 即转绿。
+
+### 6.4 无告警→auto_scale 联动（真缺口，T7 暴露）
+
+**症状**：`tests/integration/test_alert_autoscale_link.py::test_check_alerts_triggers_auto_scale_on_high_utilization` xfail。
+`backend/agenteval/web/routers/openclaw_cron_pool.py::check_alerts` 走完整条规则链只创建 `AlertHistoryDB` 行，**从不调** `cron_pool.scale_up` / `scale_down`。高利用率告警入库后无人（或外部 cron）触发 `auto_scale`，生产需要操作员看 Web UI 手动点。
+
+**注意（已修正的早期误判）**：`AlertManager` 在 router 内 per-request 新建看似 bug，但 `check_rules` 逻辑对 `duration_minutes==0` 的规则（`task_backlog`、`stuck_rate`）走 fall-through 分支直接创建 alert，不需要 `triggered_at` 持久化。`task_backlog` 端到端测试 xpass 即证明。`pool_utilization`（duration=10）若端到端测试，会暴露 per-request `triggered_at` 丢失，但当前 alert 联动缺口更优先。
+
+**影响**：高利用率/任务积压/卡死率告警频发但扩缩容不会自动发生（依赖人盯），或发生时机滞后。
+
+**修复方向**（待开独立 issue，不在 #6 范围）：
+- `check_alerts` 在创建 alert 后按 `alert_type` 映射调用 `cron_pool.scale_up` / `scale_down`；或注册 webhook 接收方；或独立 worker 轮询 `unresolved alerts` → 调 `auto_scale`。
+- 顺带把 `pool_utilization`（duration_minutes=10）规则的 `triggered_at` 持久化（如果后续要端到端测持续窗口）。
+
+**当前状态**：1 xfail 守卫在 `test_alert_autoscale_link.py`，CI 不阻塞；修复后移除 xfail 即转绿。
+
 ### 薄弱/缺失点（加固清单 T）
 
 ### 薄弱/缺失点（加固清单 T）
diff --git a/frontend/web/src/pages/CronPoolMonitor.test.tsx b/frontend/web/src/pages/CronPoolMonitor.test.tsx
new file mode 100644
index 0000000..6270fb4
--- /dev/null
+++ b/frontend/web/src/pages/CronPoolMonitor.test.tsx
@@ -0,0 +1,110 @@
+// @vitest-environment jsdom
+import { act, cleanup, render } from '@testing-library/react'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+
+vi.mock('../api', () => ({
+  openclawCronPoolApi: {
+    getStatus: vi.fn(),
+    getMetrics: vi.fn(),
+    getAlerts: vi.fn(),
+    scale: vi.fn(),
+    resolveAlert: vi.fn(),
+  },
+}))
+
+vi.mock('antd', async () => {
+  const actual = await vi.importActual<typeof import('antd')>('antd')
+  return {
+    ...actual,
+    message: { error: vi.fn(), success: vi.fn(), warning: vi.fn(), info: vi.fn() },
+  }
+})
+
+import { openclawCronPoolApi } from '../api'
+import CronPoolMonitor from './CronPoolMonitor'
+
+const statusResp = {
+  data: { pool: { total: 5, idle: 3, busy: 2, stuck: 0, min_size: 5, max_size: 20 } },
+}
+const metricsResp = { data: { metrics: { pool_utilization: 0.4, task_backlog: 0, stuck_rate: 0 } } }
+const alertsResp = { data: { alerts: [] } }
+
+beforeEach(() => {
+  Object.defineProperty(window, 'matchMedia', {
+    writable: true,
+    value: vi.fn().mockImplementation((query: string) => ({
+      matches: false,
+      media: query,
+      onchange: null,
+      addListener: vi.fn(),
+      removeListener: vi.fn(),
+      addEventListener: vi.fn(),
+      removeEventListener: vi.fn(),
+      dispatchEvent: vi.fn(),
+    })),
+  })
+  vi.useFakeTimers()
+  vi.mocked(openclawCronPoolApi.getStatus).mockResolvedValue(statusResp as never)
+  vi.mocked(openclawCronPoolApi.getMetrics).mockResolvedValue(metricsResp as never)
+  vi.mocked(openclawCronPoolApi.getAlerts).mockResolvedValue(alertsResp as never)
+})
+
+afterEach(() => {
+  vi.useRealTimers()
+  cleanup()
+})
+
+async function settle() {
+  await act(async () => {
+    await Promise.resolve()
+  })
+}
+
+describe('CronPoolMonitor polling lifecycle', () => {
+  it('polls every 5 seconds while mounted', async () => {
+    render(<CronPoolMonitor />)
+    await settle()
+    expect(openclawCronPoolApi.getStatus).toHaveBeenCalledTimes(1)
+    await act(async () => {
+      await vi.advanceTimersByTimeAsync(5000)
+    })
+    await settle()
+    expect(openclawCronPoolApi.getStatus).toHaveBeenCalledTimes(2)
+    await act(async () => {
+      await vi.advanceTimersByTimeAsync(5000)
+    })
+    await settle()
+    expect(openclawCronPoolApi.getStatus).toHaveBeenCalledTimes(3)
+  })
+
+  it('clears the polling interval on unmount', async () => {
+    const { unmount } = render(<CronPoolMonitor />)
+    await settle()
+    await act(async () => {
+      await vi.advanceTimersByTimeAsync(5000)
+    })
+    await settle()
+    const before = vi.mocked(openclawCronPoolApi.getStatus).mock.calls.length
+    unmount()
+    await act(async () => {
+      await Promise.resolve()
+      await Promise.resolve()
+    })
+    await act(async () => {
+      await vi.advanceTimersByTimeAsync(30000)
+    })
+    await settle()
+    const after = vi.mocked(openclawCronPoolApi.getStatus).mock.calls.length
+    expect(after).toBe(before)
+  })
+  it.fails('listens to visibilitychange to pause polling when tab is hidden', async () => {
+    const addSpy = vi.spyOn(document, 'addEventListener')
+    render(<CronPoolMonitor />)
+    await settle()
+    const hasVisibility = addSpy.mock.calls.some(
+      ([event]: [string]) => event === 'visibilitychange',
+    )
+    expect(hasVisibility).toBe(true)
+    addSpy.mockRestore()
+  })
+})
diff --git a/tests/integration/test_alert_autoscale_link.py b/tests/integration/test_alert_autoscale_link.py
new file mode 100644
index 0000000..c1f95e7
--- /dev/null
+++ b/tests/integration/test_alert_autoscale_link.py
@@ -0,0 +1,166 @@
+"""Alert → auto-scale end-to-end link (Gitea issue #6 / T7).
+
+The desired end-to-end behaviour: a sustained high-utilization alert must
+provoke an auto-scale-up. Today the two paths are independent — `check_alerts`
+records alerts but never invokes `auto_scale`. This test guards the desired
+end-to-end loop; the xfail marks the missing link.
+"""
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+from fastapi.testclient import TestClient
+from sqlmodel import Session, SQLModel, create_engine, select
+
+from agenteval.storage.db import IntelligentEvalTaskQueueDB, OpenClawCronPoolDB, utc_now
+from agenteval.web.app import app
+from agenteval.web.deps import get_db
+
+
+@pytest.fixture()
+def client(tmp_path):
+    from agenteval.storage.db import (  # noqa: F401
+        IntelligentEvalDB,
+        IntelligentEvalSessionDB,
+        IntelligentEvalTaskQueueDB,
+    )
+
+    engine = create_engine(
+        f"sqlite:///{tmp_path / 'test.db'}",
+        connect_args={"check_same_thread": False},
+    )
+    SQLModel.metadata.create_all(engine)
+    session = Session(engine)
+
+    def override_get_db():
+        try:
+            yield session
+        finally:
+            pass
+
+    app.dependency_overrides[get_db] = override_get_db
+    yield TestClient(app)
+    app.dependency_overrides.clear()
+    session.close()
+    engine.dispose()
+
+
+@pytest.fixture()
+def db_session(client):
+    return next(app.dependency_overrides[get_db]())
+
+
+def _seed_high_utilization_pool(db_session: Session) -> None:
+    """10 crons: 9 busy + 1 idle => pool_utilization = 0.9 (rule threshold)."""
+    for i in range(10):
+        db_session.add(
+            OpenClawCronPoolDB(
+                openclaw_cron_id=f"cron-{i}",
+                status="busy" if i < 9 else "idle",
+                last_active_at=utc_now(),
+            )
+        )
+    db_session.commit()
+
+
+def test_check_alerts_records_task_backlog_alert(
+    client: TestClient, db_session: Session
+):
+    """task_backlog threshold = 50 with duration_minutes = 0 must fire on call.
+
+    Currently fails: AlertManager is per-request — triggered_at resets every
+    request, so even duration_minutes=0 rules never re-fire on subsequent
+    calls. Tracked in .scratch/v111-architecture-scan.md.
+    """
+    from agenteval.storage.db import IntelligentEvalDB
+    eval_db = IntelligentEvalDB(
+        name="backlog-eval",
+        target_id="t1",
+        status="executing",
+        started_at=utc_now(),
+    )
+    db_session.add(eval_db)
+    db_session.commit()
+    for i in range(51):
+        db_session.add(
+            IntelligentEvalTaskQueueDB(
+                eval_id=eval_db.id,
+                status="pending",
+                priority=1,
+                reason="slot_due",
+            )
+        )
+    db_session.commit()
+
+    r = client.post("/api/openclaw/cron-pool/check-alerts")
+    assert r.status_code == 200
+    types = {a["alert_type"] for a in r.json().get("alerts", [])}
+    assert "task_backlog" in types
+
+
+@pytest.mark.xfail(
+    reason=(
+        "Known gap: no alert→auto-scale link. check_alerts records alerts but "
+        "never invokes auto_scale. An operator must observe the alert and call "
+        "/cron-pool/auto-scale manually. Tracked in "
+        ".scratch/v111-architecture-scan.md."
+    ),
+    strict=False,
+)
+def test_check_alerts_triggers_auto_scale_on_high_utilization(
+    client: TestClient, db_session: Session
+):
+    """check_alerts must drive auto_scale so high-utilization triggers a scale-up.
+
+    Today the link is missing: check_alerts is independent of auto_scale.
+    """
+    _seed_high_utilization_pool(db_session)
+
+    from agenteval.intelligent_eval import cron_pool as cron_pool_mod
+
+    real_scale_up = cron_pool_mod.scale_up
+    cron_pool_mod.scale_up = AsyncMock(return_value=1)  # type: ignore[assignment]
+    try:
+        client.post("/api/openclaw/cron-pool/check-alerts")
+        client.post("/api/openclaw/cron-pool/check-alerts")
+
+        # If the link existed, the alert would have driven a scale_up call.
+        # Today: no such call. The test asserts the desired behaviour.
+        assert cron_pool_mod.scale_up.await_count >= 1
+    finally:
+        cron_pool_mod.scale_up = real_scale_up
+
+
+@pytest.mark.xfail(
+    reason=(
+        "Known gap: no alert→auto-scale link. check_alerts records alerts but "
+        "never invokes auto_scale. An operator must observe the alert and call "
+        "/cron-pool/auto-scale manually. Tracked in "
+        ".scratch/v111-architecture-scan.md."
+    ),
+    strict=False,
+)
+def test_check_alerts_triggers_auto_scale_on_high_utilization(
+    client: TestClient, db_session: Session
+):
+    """check_alerts must drive auto_scale so high-utilization triggers a scale-up.
+
+    Today the link is missing: check_alerts is independent of auto_scale.
+    """
+    _seed_high_utilization_pool(db_session)
+
+    # Mock the OpenClaw client so auto_scale can call scale_up without
+    # actually shelling out.
+    from agenteval.intelligent_eval import cron_pool as cron_pool_mod
+
+    real_scale_up = cron_pool_mod.scale_up
+    cron_pool_mod.scale_up = AsyncMock(return_value=1)  # type: ignore[assignment]
+    try:
+        # Trigger the alert path twice (first sets triggered_at, second fires).
+        client.post("/api/openclaw/cron-pool/check-alerts")
+        client.post("/api/openclaw/cron-pool/check-alerts")
+
+        # If the link existed, the alert would have driven a scale_up call.
+        # Today: no such call. The test asserts the desired behaviour.
+        assert cron_pool_mod.scale_up.await_count >= 1
+    finally:
+        cron_pool_mod.scale_up = real_scale_up
diff --git a/tests/integration/test_decision_log_immutability.py b/tests/integration/test_decision_log_immutability.py
new file mode 100644
index 0000000..294f545
--- /dev/null
+++ b/tests/integration/test_decision_log_immutability.py
@@ -0,0 +1,143 @@
+"""Decision-log immutability & dedup contract (Gitea issue #6 / T8).
+
+Pins the desired behaviour: a decision log is append-only and not silently
+overwritten or duplicated. The current router writes through directly; once
+it moves into a service (P3), these guards must continue to pass.
+"""
+import uuid
+
+import pytest
+from fastapi.testclient import TestClient
+from sqlmodel import Session, SQLModel, create_engine, select
+
+from agenteval.intelligent_eval.models import IntelligentEvalStatus
+from agenteval.storage.db import (
+    IntelligentEvalDB,
+    IntelligentEvalDecisionLogDB,
+    utc_now,
+)
+from agenteval.web.app import app
+from agenteval.web.deps import get_db
+
+
+@pytest.fixture()
+def client(tmp_path):
+    from agenteval.storage.db import (  # noqa: F401
+        IntelligentEvalDB,
+        IntelligentEvalSessionDB,
+        IntelligentEvalTaskQueueDB,
+    )
+
+    engine = create_engine(
+        f"sqlite:///{tmp_path / 'test.db'}",
+        connect_args={"check_same_thread": False},
+    )
+    SQLModel.metadata.create_all(engine)
+    session = Session(engine)
+
+    def override_get_db():
+        try:
+            yield session
+        finally:
+            pass
+
+    app.dependency_overrides[get_db] = override_get_db
+    yield TestClient(app)
+    app.dependency_overrides.clear()
+    session.close()
+    engine.dispose()
+
+
+@pytest.fixture()
+def db_session(client):
+    return next(app.dependency_overrides[get_db]())
+
+
+def _make_eval(db_session: Session) -> IntelligentEvalDB:
+    eval_db = IntelligentEvalDB(
+        id=str(uuid.uuid4()),
+        name="eval-dl-immut",
+        target_id="t1",
+        status=IntelligentEvalStatus.EXECUTING.value,
+    )
+    db_session.add(eval_db)
+    db_session.commit()
+    return eval_db
+
+
+def _post_log(client: TestClient, eval_id: str, **overrides) -> dict:
+    body = {
+        "decision_type": "execute_session",
+        "reason": "slot_due",
+        "context": {"slot": "8-10h", "deficit": 2},
+        "cron_id": "cron-1",
+    }
+    body.update(overrides)
+    response = client.post(
+        f"/api/intelligent-evals/{eval_id}/decision-logs",
+        json=body,
+    )
+    assert response.status_code == 200, response.text
+    return response.json()
+
+
+def test_decision_log_is_append_only_on_context_change(
+    client: TestClient, db_session: Session
+):
+    """Modifying context must append, never overwrite, an existing log row."""
+    eval_db = _make_eval(db_session)
+
+    first = _post_log(
+        client, eval_db.id, context={"slot": "8-10h", "deficit": 2}
+    )
+    second = _post_log(
+        client, eval_db.id, context={"slot": "10-12h", "deficit": 1}
+    )
+
+    assert first["id"] != second["id"]
+
+    rows = db_session.exec(
+        select(IntelligentEvalDecisionLogDB)
+        .where(IntelligentEvalDecisionLogDB.eval_id == eval_db.id)
+        .order_by(IntelligentEvalDecisionLogDB.created_at)
+    ).all()
+    assert len(rows) == 2
+    # The first row's context is preserved (not overwritten by the second).
+    assert rows[0].get_context() == {"slot": "8-10h", "deficit": 2}
+    assert rows[1].get_context() == {"slot": "10-12h", "deficit": 1}
+
+
+@pytest.mark.xfail(
+    reason=(
+        "Known gap: decision-logs are appended on every call regardless of "
+        "(eval_id, decision_type, context) identity — i.e. no dedupe. The same "
+        "decision made twice produces two identical rows. Tracked in "
+        ".scratch/v111-architecture-scan.md."
+    ),
+    strict=False,
+)
+def test_decision_log_dedupes_identical_entries(
+    client: TestClient, db_session: Session
+):
+    """Identical (decision_type, context) must not insert a second row."""
+    eval_db = _make_eval(db_session)
+
+    body = {
+        "decision_type": "execute_session",
+        "reason": "slot_due",
+        "context": {"slot": "8-10h", "deficit": 2},
+        "cron_id": "cron-1",
+    }
+    for _ in range(3):
+        r = client.post(
+            f"/api/intelligent-evals/{eval_db.id}/decision-logs",
+            json=body,
+        )
+        assert r.status_code == 200
+
+    rows = db_session.exec(
+        select(IntelligentEvalDecisionLogDB).where(
+            IntelligentEvalDecisionLogDB.eval_id == eval_db.id
+        )
+    ).all()
+    assert len(rows) == 1, f"expected dedup, got {len(rows)} rows"
diff --git a/tests/integration/test_router_orm_guards.py b/tests/integration/test_router_orm_guards.py
new file mode 100644
index 0000000..bcca3ec
--- /dev/null
+++ b/tests/integration/test_router_orm_guards.py
@@ -0,0 +1,163 @@
+"""Router ORM contract guards (Gitea issue #6 / T3).
+
+These tests pin the observable behaviour of router endpoints that currently
+embed ORM writes directly (S2). When those handlers are later moved into a
+service, the tests should still pass unchanged — that is the contract.
+"""
+from datetime import timedelta
+
+import pytest
+from fastapi.testclient import TestClient
+from sqlmodel import Session, SQLModel, create_engine, select
+
+from agenteval.intelligent_eval.models import IntelligentEvalStatus
+from agenteval.storage.db import (
+    IntelligentEvalDB,
+    IntelligentEvalDecisionLogDB,
+    OpenClawCronPoolDB,
+    utc_now,
+)
+from agenteval.web.app import app
+from agenteval.web.deps import get_db
+
+
+@pytest.fixture()
+def client(tmp_path):
+    from agenteval.storage.db import (  # noqa: F401
+        IntelligentEvalDB,
+        IntelligentEvalSessionDB,
+        IntelligentEvalTaskQueueDB,
+    )
+
+    engine = create_engine(
+        f"sqlite:///{tmp_path / 'test.db'}",
+        connect_args={"check_same_thread": False},
+    )
+    SQLModel.metadata.create_all(engine)
+    session = Session(engine)
+
+    def override_get_db():
+        try:
+            yield session
+        finally:
+            pass
+
+    app.dependency_overrides[get_db] = override_get_db
+    yield TestClient(app)
+    app.dependency_overrides.clear()
+    session.close()
+    engine.dispose()
+
+
+@pytest.fixture()
+def db_session(client):
+    return next(app.dependency_overrides[get_db]())
+
+
+# T3.1 — heartbeat updates last_active_at / status / current_eval_id
+
+
+def test_heartbeat_updates_cron_fields(client: TestClient, db_session: Session):
+    cron = OpenClawCronPoolDB(
+        openclaw_cron_id="cron-1",
+        status="idle",
+        last_active_at=utc_now() - timedelta(hours=1),
+    )
+    db_session.add(cron)
+    db_session.commit()
+
+    response = client.post(
+        "/api/openclaw/crons/cron-1/heartbeat",
+        json={"status": "busy", "current_eval_id": "eval-42"},
+    )
+    assert response.status_code == 200
+
+    db_session.refresh(cron)
+    assert cron.status == "busy"
+    assert cron.current_eval_id == "eval-42"
+
+
+def test_heartbeat_404_for_unknown_cron(client: TestClient):
+    response = client.post(
+        "/api/openclaw/crons/does-not-exist/heartbeat",
+        json={"status": "busy", "current_eval_id": None},
+    )
+    assert response.status_code == 404
+
+
+# T3.2 — decision-logs POST persists to DB
+
+
+def test_create_decision_log_persists(client: TestClient, db_session: Session):
+    import uuid
+    eval_db = IntelligentEvalDB(
+        id=str(uuid.uuid4()),
+        name="eval-dl",
+        target_id="t1",
+        status=IntelligentEvalStatus.EXECUTING.value,
+    )
+    db_session.add(eval_db)
+    db_session.commit()
+
+    response = client.post(
+        f"/api/intelligent-evals/{eval_db.id}/decision-logs",
+        json={
+            "decision_type": "execute_session",
+            "reason": "slot_due",
+            "context": {"slot": "8-10h", "deficit": 2},
+            "cron_id": "cron-1",
+        },
+    )
+    assert response.status_code == 200
+
+    logs = db_session.exec(
+        select(IntelligentEvalDecisionLogDB).where(
+            IntelligentEvalDecisionLogDB.eval_id == eval_db.id
+        )
+    ).all()
+    assert len(logs) == 1
+    assert logs[0].decision_type == "execute_session"
+    assert logs[0].reason == "slot_due"
+
+
+def test_create_decision_log_404_for_unknown_eval(client: TestClient):
+    import uuid
+    response = client.post(
+        f"/api/intelligent-evals/{uuid.uuid4()}/decision-logs",
+        json={
+            "decision_type": "execute_session",
+            "reason": "slot_due",
+            "context": {},
+            "cron_id": "cron-1",
+        },
+    )
+    assert response.status_code == 404
+
+
+# T3.3 — decision-logs GET lists logs
+
+
+def test_list_decision_logs_returns_inserted(client: TestClient, db_session: Session):
+    import uuid
+    eval_db = IntelligentEvalDB(
+        id=str(uuid.uuid4()),
+        name="eval-dl-list",
+        target_id="t1",
+        status=IntelligentEvalStatus.EXECUTING.value,
+    )
+    db_session.add(eval_db)
+    db_session.commit()
+
+    for dtype in ("execute_session", "wait", "start_analysis"):
+        r = client.post(
+            f"/api/intelligent-evals/{eval_db.id}/decision-logs",
+            json={"decision_type": dtype, "reason": "test", "context": {}, "cron_id": "cron-1"},
+        )
+        assert r.status_code == 200
+
+    response = client.get(f"/api/intelligent-evals/{eval_db.id}/decision-logs")
+    assert response.status_code == 200
+    data = response.json()
+    assert "logs" in data
+    types = {log["decision_type"] for log in data["logs"]}
+    assert types == {"execute_session", "wait", "start_analysis"}