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/set_env_tool.py

@@ -0,0 +1,34 @@
+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 set_env_tool() -> ToolSpec:
+    def _handler(args: dict[str, Any]) -> dict[str, Any]:
+        key = str(args.get("key") or "").strip()
+        value = args.get("value")
+        return get_local_adapter().set_env(key=key, value=str(value) if value is not None else None)
+
+    return ToolSpec(
+        name="set_env",
+        description="Set or delete an environment variable in the current process.",
+        parameters={
+            "type": "object",
+            "properties": {
+                "key": {"type": "string", "description": "Environment variable key."},
+                "value": {"type": "string", "description": "Value to set. If omitted, deletes the key."},
+            },
+            "required": ["key"],
+            "additionalProperties": False,
+        },
+        handler=_handler,
+        tags=frozenset({"public", "local", "write"}),
+        risk_level="high",
+        timeout_s=2.0,
+    )
+
+
+__all__ = ["set_env_tool"]