docs: constrain package README summaries

packages/code-runtime/code-runtime/README.i18n.yaml

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 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/code-runtime/code-runtime/README.md
-README.md: 705484b95a3fc941d0d284c19952ef9443af56f2
-README.zh.md: e1c739792e647b2cff643e9356aa98c281b66d5d
+README.md: 70f29b0508a4466366735f1badad02ec2d85b463
+README.zh.md: e3c5d16262f05eea304cc360de2a4f3a370ab2ad

packages/code-runtime/code-runtime/README.md

@@ -9,7 +9,7 @@ English | [中文](README.zh.md)
 
 ## Summary
 
-`dsh-code-runtime` defines what a code runtime does: run one model-written program against a set of host-provided async functions and report `{ value, logs, error? }` — without dictating how any backend implements it. Load it in a composition with a backend and the service is available as `ctx.codeRuntime`; PTC mode in `dsh-tools` then runs model-written programs that compose tools. Every request runs once with no state carried between runs, and every program outcome — including failures — resolves as a result field rather than a rejection. The runtime knows nothing about tools or sessions: it is handed a program and named bindings, and everything tool-shaped stays with the consumer.
+Use `dsh-code-runtime` to run one model-written program against host-provided asynchronous functions through a configured backend. A request returns a lossless-JSON value, ordered per-channel logs, or a structured error; program failures resolve in the result, while rejected promises indicate caller misuse. Each run is isolated from prior runs, and the runtime has no knowledge of tools or sessions. Choose an execution backend separately; its language and isolation descriptors identify the required source language and execution substrate but do not themselves promise a security boundary.
 
 ## Table of Contents
 

packages/code-runtime/code-runtime/README.zh.md

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 ## 概述
 
-`dsh-code-runtime` 定义代码运行时做什么：针对一组宿主提供的异步函数运行一段模型编写的程序，并报告 `{ value, logs, error? }`——不规定任何后端如何实现。在组合中与一个后端一起加载它，服务即可作为 `ctx.codeRuntime` 使用；随后 `dsh-tools` 中的 PTC mode 即可运行组合工具的模型程序。每次请求只运行一次，运行之间不保留状态；每个程序结果——包括失败——都以结果字段 resolve，而不是 reject。运行时不了解工具或会话：调用方只向它提供程序与具名绑定，所有与工具有关的内容都留在 Consumer。
+使用 `dsh-code-runtime`，可通过已配置的后端，针对宿主提供的异步函数运行一段模型编写的程序。请求返回无损 JSON 值、通道内有序的日志或结构化错误；程序失败在结果中 resolve，而 Promise reject 表示调用方误用。每次运行都与先前运行隔离，且运行时不了解工具或会话。执行后端需另行选择；其语言与隔离描述符标明所需的源语言和执行基底，但这些描述符本身不承诺安全边界。
 
 ## 目录