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Follow-up to #319, from review. create_staging, staging_suffixes and STAGING_ATTEMPTS were copied in pdfcraft-automation and pdfcraft-ui-egui, which are both L7 and can't depend on each other. They now live once in the new pdfcraft-platform crate (L7, std only), which layers.rs already reserved with both sideways edges. A pure move: the body is unchanged apart from a StagingName parameter that keeps each caller's existing file name (.{name}.{suffix}.pdfcraft-tmp for automation, .{name}.pdfcraft-{suffix}.tmp for the desktop save). The doc comment on staging_suffixes now says the suffix is SipHash keyed from the OS random source: enough that a name can't be planted in advance, but not a CSPRNG. New tests in the platform crate pin both name forms, the 128-byte stem cut, the 16-name limit and refusal when no suffix is left. The callers' planted-file, link, folder and failed-rename tests stay where they are. Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: Brandon Thomas <echelon@gmail.com>