Why: The schema renderer and design tokens moved to the new Agent-System-UI
repo (D29); Frontend becomes the first host consuming it through the @ui
source alias so future inbox/card/workspace components land in the shared
library instead of this repo.
Evidence: tsc+build clean with modules/ui materialized; vitest 9/9 pass;
combined CSS (tokens.css + ui.css + styles.css) verified rule-identical to
the pre-migration styles.css except comments and a collision-free block
relocation; doc-ref store access replaced by injected DocBridge at the two
call sites (plugin panels, card parts, HITL forms).
Impact: Requires sibling modules/ui checkout (Dev worktree provides it); vite
dedupe keeps single react/marked copies in the bundle.
Refs: Agent-System-Documents proposal 2026-09-30-ui-inbox-command-workspace (D29)
weichen