smbclient.open_file() opens files with default share mode (read-only),
which blocks subsequent rename/delete operations because the underlying
SMB connection stays in the library's connection pool.
Use share_access="rwd" to allow concurrent read/write/delete, making
the move-after-read operation deterministically work.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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