[Improvement: SparseTree] Implement Next Planned Feature#70

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atomantic wants to merge 2 commits intomainfrom

cos/task-app-improve-2eeb4b29-6e35-49ad-a2fc-4b2b87a72572-feature-ideas-mnhloaxx/agent-4f38e91a

Commits on Apr 2, 2026

feat(relationships): add manual relationship linking for parents, spouses, and children
atomantic
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docs: mark Phase 15.20 (relationship linking) as complete
atomantic
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