~x-ai/grok-latest → A (3:1)

A removes dual-path legacy GitDiscovery projection from epoch/commit pages, deletes _legacy_* helpers, and makes Emission evidence fields required—enforcing a single lasting Evidence-envelope model with updated tests. B usefully consolidates hardcoded OAuth/redirect base URLs behind HOSTNAME/window.location.origin and flips Fly deploy to staging, but that is incremental host/deploy hygiene versus A’s core schema and read-path simplification.