weichen
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Why: The approved frontend redesign requires a durable design constitution
so future UI work stays consistent (user directive: make this project's
standing design guidance, four principles: beautiful/modern/concise/usable).
DESIGN.md encodes the Zai-calibrated rules (surface ladder, type scale,
radius nesting, MotionKit recipes, ToolBlock contract, IA principles) and
AGENTS.md adds a mandatory UI gate; submodules land phase 1 (tokens v3,
MotionKit, Collapsible, panel layout, mono primary buttons).
Evidence: make test in this worktree -> frontend 38 passed (incl. new
host design-guard ratchet), ui 61 passed (incl. collapsible + design-guard),
go core/backend/agent-command ok. precheck READY at R0 0be23f9a4d.
Impact: gitlinks advance to Agent-System-UI/Agent-System-Frontend
feature/ui-tokens-v3 heads; AGENTS.md gains a UI section; no backend or
contract changes.
Refs: session-approved redesign plan v2 (8 decisions recorded in task card).
ui
@ eea9978d8b