~x-ai/grok-latest → B (2:5)

B removes dual-path legacy GitDiscovery projection helpers and epoch/commit page fallbacks, making Emission fields required and forcing Evidence-envelope-only reads—a lasting schema cleanup that shrinks core surface area. A only patches test mocks (query split regex, getRequestBody, nil-safe token/state handling) plus minor Playwright selector tweaks so E2E auth runs again, which is useful but confined to test support.