补齐本地 public 工具的 P1/P2/P3 能力。

新增目录列举、文件/目录操作、内容搜索、cwd/env 管理与进程管理工具，并在本地适配层统一实现与测试覆盖，保持风险门控策略一致。

Made-with: Cursor

runtime/tools/public/cd_tool.py

@@ -0,0 +1,30 @@
+from __future__ import annotations
+
+from typing import Any
+
+from oclaw.runtime.tools.base import ToolSpec
+from oclaw.runtime.tools.local_sdk import get_local_adapter
+
+
+def cd_tool() -> ToolSpec:
+    def _handler(args: dict[str, Any]) -> dict[str, Any]:
+        cwd = str(args.get("cwd") or "").strip()
+        return get_local_adapter().cd(cwd=cwd)
+
+    return ToolSpec(
+        name="cd",
+        description="Change current working directory for local tools (best-effort, per-process).",
+        parameters={
+            "type": "object",
+            "properties": {"cwd": {"type": "string", "description": "Directory to change into."}},
+            "required": ["cwd"],
+            "additionalProperties": False,
+        },
+        handler=_handler,
+        tags=frozenset({"public", "local", "write"}),
+        risk_level="high",
+        timeout_s=5.0,
+    )
+
+
+__all__ = ["cd_tool"]