feat(engine): 添加MCP连接管理和工具集成功能

- 集成MCP连接管理器，支持MCP服务器连接
- 添加多种内置工具：ClarifyTool、CronTool、DelegateTool、ExecuteCodeTool、
  PatchFileTool、ProcessTool、SendMessageTool、SpawnTool、TerminalTool、
  TodoTool、WebFetchTool、WebSearchTool、WriteFileTool等
- 实现工具注册和装配功能
- 添加技能选择上下文参数
- 支持思考模式控制参数thinking_enabled

feat(coordinator): 重构任务执行计划器参数命名

- 将learning_candidate_enabled重命名为allow_candidate_generation
- 更新TeamGraphScheduler中的参数传递
- 修改LocalAgentRunner中的相关参数处理
- 更新README文档中的相应描述

refactor(context): 标准化工具调用参数格式

- 添加_json导入用于参数序列化
- 实现_provider_tool_calls方法标准化OpenAI兼容的工具调用载荷
- 修复工具调用中参数非字符串类型的序列化问题

refactor(session): 优化消息历史记录过滤逻辑

- 修改get_messages_as_conversation为基于运行状态过滤消息
- 排除未完成、失败或错误结束的运行记录
- 改进对话历史的可见性控制机制

fix(store): 修复FTS索引重建逻辑

- 添加异常处理防止FTS索引创建失败
- 实现_rebuild_fts_index方法重新构建全文搜索索引
- 优化索引触发器和表的维护流程

app-instance/backend/tests/unit/test_cron_service.py

@@ -0,0 +1,126 @@
+import asyncio
+
+from beaver.foundation.models import CronExecutionResult, CronRunRecord, CronSchedule
+from beaver.tools.base import ToolContext
+from beaver.tools.builtins import CronTool
+from beaver.services.cron_service import CronService, compute_next_run, parse_schedule, schedule_from_api
+
+
+def test_parse_hermes_style_schedules() -> None:
+    interval = parse_schedule("every 15m")
+    assert interval.kind == "every"
+    assert interval.every_ms == 15 * 60 * 1000
+
+    one_shot = parse_schedule("30s")
+    assert one_shot.kind == "at"
+    assert one_shot.at_ms is not None
+
+    cron = parse_schedule("0 9 * * *")
+    assert cron.kind == "cron"
+    assert cron.expr == "0 9 * * *"
+
+
+def test_schedule_from_frontend_payload() -> None:
+    every = schedule_from_api({"every_seconds": 60})
+    assert every.kind == "every"
+    assert every.every_ms == 60_000
+
+    cron = schedule_from_api({"cron_expr": "0 10 * * *"})
+    assert cron.kind == "cron"
+
+
+def test_compute_next_run_skips_missed_interval() -> None:
+    schedule = CronSchedule(kind="every", every_ms=60_000)
+    assert compute_next_run(schedule, now_ms=1_000_000, last_run_at_ms=0) > 1_000_000
+
+
+def test_manual_run_records_task_history(tmp_path) -> None:
+    async def on_job(job):
+        return CronExecutionResult(response="done", task_id=f"task-{job.id}", run_id="run-1")
+
+    service = CronService(tmp_path / "jobs.json", on_job=on_job)
+    job = service.add_job(
+        name="Daily check",
+        message="Check the project",
+        schedule=CronSchedule(kind="every", every_ms=3600_000),
+        session_key="web:default",
+    )
+
+    assert asyncio.run(service.run_job(job.id, force=True)) is True
+    updated = service.get_job(job.id)
+    assert updated is not None
+    assert updated.last_status == "ok"
+    assert updated.history[-1].task_id == f"task-{job.id}"
+    assert updated.to_api_dict()["last_task_id"] == f"task-{job.id}"
+
+
+def test_manual_run_records_scheduled_run_output(tmp_path) -> None:
+    async def on_job(job, run):
+        return CronExecutionResult(
+            response=f"notification for {run.scheduled_run_id}",
+            run_id="run-notify",
+            notification_session_id="notify:default:scheduled",
+            mode="notification",
+        )
+
+    service = CronService(tmp_path / "jobs.json", on_job=on_job)
+    job = service.add_job(
+        name="Daily news",
+        message="Summarize news",
+        schedule=CronSchedule(kind="every", every_ms=3600_000),
+    )
+
+    assert asyncio.run(service.run_job(job.id, force=True)) is True
+    updated = service.get_job(job.id)
+    assert updated is not None
+    run = updated.history[-1]
+    assert run.scheduled_run_id
+    assert run.output == f"notification for {run.scheduled_run_id}"
+    assert run.notification_session_id == "notify:default:scheduled"
+    assert updated.to_api_dict()["last_scheduled_run_id"] == run.scheduled_run_id
+
+
+def test_cron_tool_uses_runtime_service(tmp_path) -> None:
+    service = CronService(tmp_path / "jobs.json")
+    tool = CronTool()
+    result = asyncio.run(
+        tool.invoke(
+            {
+                "action": "add",
+                "name": "Tool-created task",
+                "message": "Check the queue",
+                "every_seconds": 300,
+            },
+            ToolContext(session_id="session-1", services={"cron_service": service}),
+        )
+    )
+
+    assert result.success is True
+    jobs = service.list_jobs(include_disabled=True)
+    assert len(jobs) == 1
+    assert jobs[0].payload.session_key == "session-1"
+
+
+def test_mark_run_engaged_links_task(tmp_path) -> None:
+    service = CronService(tmp_path / "jobs.json")
+    job = service.add_job(
+        name="Daily news",
+        message="Summarize news",
+        schedule=CronSchedule(kind="every", every_ms=3600_000),
+    )
+    run = CronRunRecord(
+        started_at_ms=1,
+        status="ok",
+        output="news summary",
+        notification_session_id="notify:default:scheduled",
+    )
+    job.history.append(run)
+    service._save_jobs()
+
+    linked = service.mark_run_engaged(run.scheduled_run_id, task_id="task-1", intent="revise_once")
+
+    assert linked is not None
+    updated = service.get_run(run.scheduled_run_id)
+    assert updated is not None
+    assert updated[1].engaged is True
+    assert updated[1].task_id == "task-1"