- Preserve --zip --delete (real tested feature), only --compare-* hard-error - Mandate .as_posix() arcnames; --data-only, SCRATCH_DIR, atomicity-honesty notes - Progress tracking stays in command; sinks decoupled from PaperlessCommand - Compression spec: gate/verify zstd, fix import failure mode, patchable probe seam Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>