Documents the umbrella-first MVP decision (2026-05-24). This repo remains
INTENT-only until the binding model and rect-registry contract stabilize
through real product use. Reconciles relation vocabulary against umbrella
SharedContracts §2.5: derived-from dropped as domain-specific; needs-check
moved onto EvidenceLink.status. Reaffirms: binder depends on engine + anchor,
not on source or work.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
