Records how an installation runs the Dashboard and the API on sibling
hostnames (dash./api.) beside the default same-origin topology, from one
image: the API origin reaches the Dashboard at run time in a meta element,
the display host stays on the API's origin (device cookies and the offline
code cache depend on it), the API trusts its own origin as Better Auth
already does, cookies stay host-only, CORS stays narrow and becomes part of
the module UI contract, the reference proxy gains per-hostname routing, and
the deploy smoke test proves both topologies, the split one in a real
browser.
Amends ADR 0034 and extends ADR 0044.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
