Daemon disk probe (File.exists).
Distinct from index membership (Folder.fetch_file) and content load ( read). Callers use this for create-vs-modify and validate; **🚫** do not probe existence via read.
Wire: response.msg is ((int) GLib.FileType) as decimal (GLib.FileType.UNKNOWN = path absent or RPC error).
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File type on daemon disk; GLib.FileType.UNKNOWN when absent |