docs(04): create phase 4 plan (9 plans, 7 waves)
Folders, Sharing, Quotas & Document UX — plans verified (0 blockers, 2 non-blocking warnings). Covers FOLD-01..05, SHARE-01..05, SEC-08/09, ADMIN-06, DOC-01/02. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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