nbari / backup / 27099484040

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Add edit/restore commands and the DESIGN.md data-plane spec

- edit: add/remove a backup's directories and files (normalize & replace);
  shared clap validators extracted to commands/validators.rs.
- restore: wired placeholder (id/path/version + --into) with a TODO; blocked on
  the data plane.
- DESIGN.md: architecture and data-plane spec — fast metadata snapshot + async
  multi-destination upload, content-defined chunking dedup, compress-then-encrypt
  with per-chunk keys wrapped to the public key (multi-recipient planned), file
  manifests, packs + Storage trait, zero-knowledge store with a naming-key
  manifest MAC + local rollback state, file-metadata preservation, and
  verify/status/prune with GFS retention. Consolidates issues
  #1,#3,#4,#5,#6,#8,#18,#19.

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