refactor(e2b): narrow the sandbox POC

packages/e2b/fs-e2b/README.i18n.yaml

@@ -2,5 +2,5 @@
 # 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/e2b/fs-e2b/README.md
-README.md: 6827e16e9c45532590ee1aa986c18a353d175fdc
-README.zh.md: 21b067829ea95c4581d7e89f3d225f9c90e630ef
+README.md: cd170bcbe2831b0856b51791a2045382d93c1148
+README.zh.md: f97790cf1d4ef90f042df8ed564723e186327f00

packages/e2b/fs-e2b/README.md

@@ -24,8 +24,8 @@ No direct invalidation; the named consumer owns any request-prefix changes.
 
 ## Known Limitations and Deferred Work
 
-- **No host synchronization** — an empty E2B cwd stays empty until a tool, command, template, or external process populates it; local files are neither uploaded nor reflected back.
+- **No host synchronization** — an empty E2B cwd stays empty until a tool, command, or external process populates it; local files are neither uploaded nor reflected back.
 - **Mutation coordination is host-process-local** — another harness connection or remote command can race the adapter; version guards detect only metadata changes represented by E2B.
 - **Reads reopen canonical targets by path** — a concurrent remote path replacement between resolution and stream opening is not fenced by a stable file handle; no observed product defect justifies a provider-specific bounded-read protocol in this POC.
 - **Whole-file mutation costs remain** — overwrite diffs and literal edits read complete files into host memory, and every operation incurs E2B controller latency.
-- **Custom templates must support the used Linux/GNU and E2B filesystem features** — `realpath -mz`, `base64 -w0`, `chmod`, same-filesystem rename, streaming reads, and file metadata extended attributes are required; unsupported templates fail rather than degrade silently.
+- **The POC targets E2B's default Linux image** — it relies on GNU `realpath`/`base64`/`chmod`, same-filesystem rename, streaming reads, and metadata extended attributes; custom templates are outside this POC.

packages/e2b/fs-e2b/README.zh.md

@@ -24,8 +24,8 @@
 
 ## 已知限制与延后工作
 
-- **不提供宿主同步**：空的 E2B cwd 会一直为空，直到工具、命令、模板或外部进程填充它；本地文件既不会上传，也不会同步回本地。
+- **不提供宿主同步**：空的 E2B cwd 会一直为空，直到工具、命令或外部进程填充它；本地文件既不会上传，也不会同步回本地。
 - **变更协调仅限宿主进程内**：另一个 harness 连接或远程命令可能与适配器发生竞态；版本防护只能检测 E2B 元数据所体现的变更。
 - **读取会按路径重新打开规范化目标**：在解析与打开流之间若并发替换远程路径，该操作没有稳定文件句柄提供围栏；在该 POC 中，没有已观察到的产品缺陷能够证明提供方专用的有界读取协议值得引入。
 - **仍需承担完整文件变更成本**：覆盖差异和字面量编辑会把完整文件读入宿主内存，每项操作也都会产生 E2B 控制器延迟。
-- **自定义模板必须支持所用的 Linux/GNU 与 E2B 文件系统功能**：必须支持 `realpath -mz`、`base64 -w0`、`chmod`、同一文件系统内的 rename、流式读取和文件元数据扩展属性；不支持的模板会失败，而不会静默降级。
+- **该 POC 面向 E2B 默认 Linux 镜像**：它依赖 GNU `realpath`／`base64`／`chmod`、同一文件系统内的 rename、流式读取和元数据扩展属性；自定义模板不在该 POC 范围内。

packages/e2b/fs-e2b/tests/filesystem.spec.ts

@@ -275,7 +275,6 @@ async function setup(remote = new FakeRemote()): Promise<{ ctx: Context; fs: E2B
   const runtime = {
     cwd: '/workspace',
     runtimeRoot: '/workspace/.dsh-e2b',
-    disposeMode: 'kill',
     getSandbox: async () => remote.sandbox,
   } as unknown as E2BSandboxService
   ctx.provide('e2b', runtime)