v0.8.1

Fixed

• normalizeLabel strips the wrapper Apple's Contacts API puts around its
  predefined label constants, so _$!<Home>!$_ normalizes to home instead of
  reaching a wallet's UI verbatim. A wrapper around blank text falls back to
  other. Labels the user typed themselves arrive unwrapped and are unaffected.
  The wrapper is stripped, nothing more; labels are not mapped onto a canonical
  cross-platform vocabulary.
• upgradeContactData re-normalizes every stored entry label, so contacts
  written before this fix are repaired when they are loaded. The import path
  alone could not reach them: a row edited in the wallet is never overwritten by
  a re-import, and a wallet that only receives contacts over sync never imports
  at all.

Contacts imported on iOS before this release get new labels, so their payloads
change on the first write after it. Expect one round of sync traffic for those
rows.