Settle commercial identity nuances with consolidated enums and linking rules

Add commercial-identity-nuance-settlement.md resolving control_basis,
binding_trigger, cross-registry Synonymity strengths, OPI branch modeling,
escrow commitment type, reputation portability, payment edge cases, CRM renewal
rules, Person Account adapters, and eIDAS wallet scope. Update canon, OpenQuestions,
and all commercial-identity source notes.

research/commercial-identity/kyc-aml-commercial-identity-binding.md

@@ -90,12 +90,12 @@ high-stakes counterparty records**.
 
 ## Open Questions
 
-- Standard `control_basis` enum across US CDD and EU AMLD wording.
-- How to model BOI registry volatility in lifecycle without canon becoming legal advice?
+*(none — settled in `commercial-identity-nuance-settlement.md`)*
 
-## Resolved (see beneficial-ownership-kyc-boi.md)
+## Settled
 
-- Beneficial Owner → **Beneficial Ownership Relationship** (dedicated type, not Ownership subtype).
+- Beneficial Owner → **Beneficial Ownership Relationship**; `control_basis` enum;
+  CDD vs. BOI filing layered separately.
 
 ## References