The Cobra generated PowerShell completion script captures rclone's output
through a pipeline with Invoke-Expression. PowerShell decodes that output
using [Console]::OutputEncoding, which on non-UTF-8 hosts (for example
PowerShell 5.1 on a Windows install with an OEM code page such as CP852)
misinterprets the UTF-8 bytes rclone emits and corrupts remote and path
names containing non-ASCII characters, so tab completion produces a path
that does not exist.
Inject "[Console]::OutputEncoding = [System.Text.Encoding]::UTF8" into the
generated script immediately before the Invoke-Expression call. This is safe
on PowerShell 7+, where UTF-8 is already the default. If the expected line is
not present (for example after a Cobra template change) the script is emitted
unmodified so we never produce a corrupted completion script.
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