refactor: hide filesystem implementation helpers

packages/fs/fs-local/README.md

@@ -23,4 +23,4 @@ await ctx.plugin(LocalFileSystem, { cwd: process.cwd() })
 
 `config.cwd` is a resolution default, not a containment boundary — absolute paths and `..` escape it. Enforce containment with a stricter `ctx.fs` backend or a permission plugin on the `tools/execute` waterfall. See [the filesystem capability-seam RFC's Consequences section](../../../docs/rfc/implemented/architecture/2026-06-17-filesystem-capability-seam.md#consequences).
 
-The raw I/O lives in `src/fsio.ts` (Cordis-free, independently unit-tested); `src/index.ts` is the thin service wiring.
+The package-root SDK surface is the default/named `LocalFileSystem` class plus `Config`. Raw I/O lives in `src/fsio.ts` (Cordis-free, independently unit-tested); `src/index.ts` is the thin service wiring.

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

@@ -40,20 +40,6 @@ import {
 } from './fsio.ts'
 import type { FsIoInternals } from './fsio.ts'
 
-export {
-  applyLiteralEdit,
-  listDirectory,
-  probe,
-  readForEdit,
-  readTextForDiff,
-  readWholeText,
-  resolveLocalTarget,
-  restoreLineEndings,
-  streamWholeText,
-  writeFileAtomic,
-} from './fsio.ts'
-export type { FsIoInternals, LineEndings, LocalDirEntry, LocalTarget, PathInfo } from './fsio.ts'
-
 /** Configuration for the local filesystem backend. */
 export interface Config {
   /** Base directory for relative paths. Defaults to `process.cwd()`. */

packages/fs/fs-local/tests/fsio.spec.ts

@@ -20,8 +20,8 @@ import {
   restoreLineEndings,
   streamWholeText,
   writeFileAtomic,
-} from '@deepseek-ai/dsh-fs-local'
-import type { LocalTarget } from '@deepseek-ai/dsh-fs-local'
+} from '../src/fsio.ts'
+import type { LocalTarget } from '../src/fsio.ts'
 import { FsError, FsTargetKey } from '@deepseek-ai/dsh-fs'
 
 let dir: string