Refine RemoteFileMultiInfoCommand semantics: dedup inputs, per-path stat errors, and cancellation

[Copilot]

This follow-up tightens the new multi-file remote stat RPC behavior to match expected usage: duplicate input paths are skipped, per-path stat failures no longer fail the entire call, and cancellation is respected during iteration.

• RPC response model

  • Added staterror to FileInfo:
    • StatError string \json:"staterror,omitempty"``
  • Generated TS type now exposes staterror?: string on FileInfo.

• RemoteFileMultiInfoCommand behavior updates

  • Dedup: if an input path key is already present in the result map, the loop continues.
  • Non-fatal stat failures: on fileInfoInternal error, the command now emits a FileInfo entry for that input with:
    • resolved path, dir, name
    • staterror populated with err.Error()
    • continues processing remaining paths.
  • Cancellation: checks ctx.Err() at the top of each iteration and returns immediately if canceled.

• PR scope cleanup

  • Removed the previously added test file from this PR per request.

if _, found := rtn[path]; found {
    continue
}
if ctx.Err() != nil {
    return nil, ctx.Err()
}
fileInfo, err := impl.fileInfoInternal(cleanedPath, false)
if err != nil {
    rtn[path] = wshrpc.FileInfo{
        Path:      wavebase.ReplaceHomeDir(cleanedPath),
        Dir:       computeDirPart(cleanedPath),
        Name:      filepath.Base(cleanedPath),
        StatError: err.Error(),
    }
    continue
}

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