Merge remote-tracking branch 'origin/master' into worktree/agent-loop-testkit

# Conflicts:
#	packages/README.md

packages/fs/tool-fs/tests/tools.spec.ts

@@ -14,6 +14,7 @@ import type {
   FsEditOutcome,
   FsEditRequest,
   FsInfo,
+  FsPathInfo,
   FsTarget,
   FsWriteIntent,
   FsWriteOutcome,
@@ -44,6 +45,11 @@ class FakeFs extends FileSystem {
     if (content === undefined) return undefined
     return { version: FsVersion('v1'), type: 'file', size: content.length }
   }
+  override async lstat(path: string): Promise<FsPathInfo | undefined> {
+    const content = this.files.get(`key:${path}`)
+    if (content === undefined) return undefined
+    return { version: FsVersion('v1'), type: 'file', size: content.length }
+  }
   override async readText(target: FsTarget): Promise<string> {
     return this.files.get(target.targetKey) ?? ''
   }