docs: add Phase 5 implementation plan — dossier versions
9 tasks covering schema migration, API changes, UI updates, and verification. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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9 tasks covering schema migration, API changes, UI updates, and verification. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>