fix(docs): correct OpenClaw exec permission instructions (#142)

- Replace invalid `/config set exec.allow true` with correct
  `openclaw config set tools.profile "coding"`
- Fix config filename: config.json → openclaw.json
- Update explanation to reference tools.profile system

Co-authored-by: Panniantong <panniantong@users.noreply.github.com>

README.md

@@ -94,13 +94,13 @@ AI Agent 已经能帮你写代码、改文档、管项目——但你让它去
 
 > ⚠️ **OpenClaw 用户请先确认 exec 权限已开启**
 >
-> Agent Reach 依赖 Agent 执行 shell 命令（`pip install`、`mcporter`、`xreach` 等）。OpenClaw 从 2026 年 1 月起默认禁用 exec 工具，**安装前请先在 OpenClaw 配置中开启 exec 权限**：
+> Agent Reach 依赖 Agent 执行 shell 命令（`pip install`、`mcporter`、`xreach` 等）。如果你的 OpenClaw 使用了默认的 `messaging` 工具配置，Agent 将无法执行命令。**安装前请先开启 exec 权限**：
 >
+> ```bash
+> openclaw config set tools.profile "coding"
 > ```
-> /config set exec.allow true
-> ```
-> 或在 `~/.openclaw/config.json` 中设置 `"exec": { "allow": true }`。
-> 开启后重新对话即可继续安装。其他平台（Claude Code、Cursor、Windsurf 等）不受此限制。
+> 或在 `~/.openclaw/openclaw.json` 中设置 `"tools": { "profile": "coding" }`。
+> 设置后重启 Gateway（`openclaw gateway restart`）并开启新对话即可。其他平台（Claude Code、Cursor、Windsurf 等）不受此限制。
 
 复制这句话给你的 AI Agent（Claude Code、OpenClaw、Cursor 等）：
 
@@ -319,7 +319,7 @@ Reddit 封锁数据中心 IP。配置一个住宅代理即可解决：`agent-rea
 
 Yes! Agent Reach is an installer + configuration tool — any AI coding agent that can run shell commands can use it. Works with Claude Code, Cursor, OpenClaw, Windsurf, Codex, and more. Just `pip install agent-reach`, run `agent-reach install`, and the agent can start using the upstream tools immediately.
 
-**OpenClaw note:** Since January 2026, OpenClaw disables the `exec` tool by default. Agent Reach requires exec to run shell commands. Enable it first: `/config set exec.allow true` (or set `"exec": { "allow": true }` in `~/.openclaw/config.json`), then restart the conversation before installing.
+**OpenClaw note:** If your OpenClaw is using the default `messaging` tool profile, the agent won't be able to run shell commands. Enable exec first: `openclaw config set tools.profile "coding"` (or set `"tools": { "profile": "coding" }` in `~/.openclaw/openclaw.json`), then restart the Gateway and start a new conversation before installing.
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