The CMS engine is now consumed from openbureau-core instead of this repo's own
copy. cms/core = openbureau-core (subtree of its main). docker-compose builds the
cms image from ./core (core's own Dockerfile → core/admin + core/api), and a new
cms/openbureau.config.js (CMS_CONFIG) tells the generic engine this site's content
model + plugins (dialog). Old vendored cms/api + cms/admin removed.
Behaviour-preserving: core's admin/src is byte-identical to the old one, and core's
API was live-verified byte-identical against the running stack. Schema stays owned
by the stack's migrate service (db/schema.sql incl. dialog tables); DATABASE_URL
left unset so core's plugin migration runner is a no-op here. Update core later with
`git subtree pull --prefix=cms/core <core> main --squash`.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
