Apply the no-internal-citation and WHY-not-WHAT rules to source
comments; correct stale identifiers (NewBrowser, PBKDF2Key) and RFC
facts (Yandex ciphertext, Firefox PBKDF2 password).
* feat(restore): cross-platform restore via dump engine rebuild (#606)
Restore previously required the dump's origin OS, overlaying keys onto locally-discovered browsers. It now rebuilds Chromium engines from the dump's vaults (v2 adds engine kind), so copied data or an archive zip decrypts on any OS.
* fix(restore): polish help text, drop dead check, dedup dump kinds
pflag treats backticked words in flag usage as the value placeholder,
so --data-zip rendered as "--data-zip archive" in help output.