Why: Foundation task T0 of the UI/interaction base (proposal 2026-09-30, D25-D33): add the new UI component library and command-bus ecosystem repos, extend build/test/pin orchestration to twelve submodules. Evidence: make test green on the pinned combo (core + backend 13 pkgs + frontend 9 + ui 6 tests); make build produces bin/agent-system with combo version string including ui; make contracts now generates to frontend and ui with submodules staying clean; renderer/tokens migration verified CSS-rule-identical (zero behavior change). Impact: New modules/ui and deps/agent-command gitlinks; frontend consumes ui via source alias; backend vendors agent-command (replace only, no import yet); follows provider-first merges (ui PR#1/#2, agent-command PR#1, documents PR#8, frontend PR#2, backend PR#6). Refs: modules/documents docs/proposals/2026-09-30-ui-inbox-command-workspace.md
ui
@ 77c4baccce