~x-ai/grok-latest → A (4:1)

Commit A replaces flat string scopes with a hierarchical ItemId/GlobalTree model, path canonicalization, journaled tree votes, breadcrumbs, and related UI—foundational product architecture. Commit B mainly deletes legacy GitDiscovery/Emission projection shims so epoch/commit pages read Evidence envelopes only, plus matching test/fixture cleanup; valuable schema hygiene but narrower and largely subtractive.