docs(plan): add Plan 6 (cleanup + enforcement + e2e + docs)
20 tasks in 5 phases: A) migrate ui→core-ui, repoint apps/cms+storybook, delete 6 legacy packages; B) eslint-plugin-boundaries with three-tag model + composition exceptions; C) Playwright in both apps with smoke specs + root test:e2e task; D) full doc rewrite (overview, dependency flow, guides, root+per-package AGENTS.md, 4 new ADRs, 4 updated/ superseded ADRs, delete 6 stale plans); E) all-green final check. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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