Partial §66 reversal (owner 2026-07-22): display_name (was identity preset) and
theme (was standard field) become models.ProfileCore fields, present + serialized
on every profile by default. Registry keeps currency/measurement/geohash +
first_last_name. Migration 0017. Frontends can still hide either per host.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>