feat(sandbox-policy): describe enforced file families

packages/fs/fs-sandbox/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/fs/fs-sandbox/README.md
-README.md: 790444a4184b9bcccd3a0798cf0c09cb6f1b166e
-README.zh.md: d54bdcbe65673b6892ebd1d539dd066f66d68cb6
+README.md: a376f2c23dca9f0895525fa274a1ae0545823f63
+README.zh.md: 4fa2deecb7d10124da8b7920997196b816457fcc

packages/fs/fs-sandbox/README.md

@@ -22,11 +22,19 @@ A denial is a structured `FsError` (`FS_SANDBOX_DENIED`, carrying the effective
 
 ## Model Experience
 
-Indirectly, through `dsh-tool-fs`, which renders this backend's `FS_SANDBOX_DENIED` refusals as the `[sandbox: file access denied under <mode> mode]` marker plus the same-turn escalation hint.
+### Filesystem policy and refusals
+
+#### What the model sees
+
+This backend contributes the write/edit family to the owner-rendered `sandbox:policy` section. Indirectly, `dsh-tool-fs` renders its `FS_SANDBOX_DENIED` refusals as the `[sandbox: file access denied under <mode> mode]` marker plus the same-turn escalation hint.
+
+#### Token effect
+
+The current-policy clause adds a small fixed prefix while this backend is mounted; a denial adds the bounded marker and escalation hint to conversation history.
 
 #### KV Cache effect
 
-No direct invalidation; the named consumer owns any request-prefix changes.
+A standing-policy or family-composition change updates the owner-rendered request prefix; operation results remain append-only.
 
 ## Known Limitations and Deferred Work
 

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

@@ -22,11 +22,19 @@
 
 ## 模型体验
 
-通过 `dsh-tool-fs` 间接产生影响；该消费方把本后端的 `FS_SANDBOX_DENIED` 拒绝渲染为 `[sandbox: file access denied under <mode> mode]` 标记和同轮次升级提示。
+### 文件系统策略与拒绝
+
+#### 模型看到的内容
+
+该后端会向归属方渲染的 `sandbox:policy` 段落贡献 write/edit 家族。作为间接影响，`dsh-tool-fs` 会把本后端的 `FS_SANDBOX_DENIED` 拒绝渲染为 `[sandbox: file access denied under <mode> mode]` 标记和同轮次升级提示。
+
+#### Token 影响
+
+该后端挂载期间，当前策略条款会在前缀中增加少量固定内容；拒绝则会把有界标记和升级提示追加到对话历史。
 
 #### KV Cache 影响
 
-不会直接使缓存失效；上述消费方负责请求前缀的任何变化。
+常驻策略或家族组合发生变化时，归属方渲染的请求前缀会更新；操作结果保持仅追加。
 
 ## 已知限制与暂缓事项
 

packages/fs/fs-sandbox/src/index.ts

@@ -63,6 +63,7 @@ export class SandboxedFileSystem extends LocalFileSystem {
   constructor(ctx: Context, config: Config) {
     super(ctx, config)
     this.defaultMode = ctx.sandboxPolicy.defaultMode
+    ctx.sandboxPolicy.registerEnforcedFamily('filesystem')
   }
 
   /** The deployment default mode — the capability fact the tool layer reads to advertise escalation. */