docs(design-system): add canvas architecture + known issues from Core-FE
Added from Core-FE verified findings:
- Canvas stack: @xyflow/react v12, Next.js 14, Tailwind v4, Zustand
- Directory structure with verified file locations
- Known issues: secrets-store.ts getGrouped() performance bug
- Pre-commit hook verification needed
- Tech debt items: any types, selector memoization, use client enforcement
Updated canvas-audit-items.md with architecture section.
Co-Authored-By: Core-FE <core-fe@moleculesai.app>
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Molecule AI Core-UIUX
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