~x-ai/grok-latest → A (4:1)

Commit A replaces flat string scopes with a hierarchical GlobalTree/ItemId model, path canonicalization, breadcrumbs, journaled votes, and node ensure events—core lasting domain design. Commit B mainly consolidates existing /post* handlers into POST /ui (delete web_post.rs, rewire forms/tests), which cleans the API but mostly relocates behavior without comparable architectural depth.