Deepen beneficial ownership and registry identifier research; resolve canon questions

Add source notes on FinCEN CDD/BOI beneficial ownership and ISO 6523/ALEI
registry identifier subtypes. Resolve OpenQuestions: Beneficial Ownership
Relationship as dedicated type; Registry Identifier and Proxy Commercial
Identifier as Reference layer specializations. Update glossary, conceptual
model, terminology, downstream recommendations, and corpus index.

canon/CanonicalGlossary.md

@@ -67,6 +67,31 @@ A value or reference used to distinguish or refer to something within a scope.
 Examples: username, email address, LDAP DN, OIDC subject, SAML NameID, DID,
 employee number, external source ID.
 
+## Registry Identifier
+
+An **Identifier** issued under a registered organization-identification scheme
+with a known issuing authority, jurisdiction, and (when applicable) renewal
+lifecycle.
+
+Examples: LEI (ISO 17442 / ICD 0199), national company registration number,
+SAM.gov UEI, VAT number, ALEI (ISO 8000-116).
+
+Recommended fields: `scheme` (ICD or scheme URI), `authority`, `authority_class`,
+`jurisdiction`, `value`, `renewal_required`, `lifecycle_state`, `evidence_source`.
+
+Registry records (GLEIF entry, D&B profile, SAM registration) map to
+**Commercial Record** or **Identity Record**, not to the identifier itself.
+Link multiple Registry Identifiers for the same entity via **Synonymity
+Assertion** when evidenced.
+
+## Proxy Commercial Identifier
+
+A **Registry Identifier** with `authority_class: commercial_proxy` — issued by a
+vendor-operated registry that does not create legal entities.
+
+Examples: DUNS (D&B, ICD 0060). Used for credit, procurement, and trade
+verification. Distinct from government **ALEI** or incorporating-register IDs.
+
 ## Scoped Identifier
 
 An identifier whose meaning is intentionally limited to a relying party,
@@ -156,11 +181,33 @@ Organization when the distinction matters for modeling.
 ## Beneficial Owner
 
 A natural person who ultimately owns or controls a legal entity customer in
-regulated commercial contexts (KYC/AML).
+regulated commercial contexts (KYC/AML, FATF R24).
 
-Maps to **Natural Person** linked to **Organization** or **Legal Entity** via
-**Ownership Relationship** or **Representation Relationship**, with **Evidence
-Source** from CDD/EDD onboarding. Not a substitute for Organization actor.
+Beneficial Owner is a **role label** for the person, not a participation root.
+Model the regulatory linkage with **Beneficial Ownership Relationship** from
+the Natural Person to the Organization or Legal Entity customer. Attach
+**Evidence Source** from CDD/EDD onboarding, BOI filing, or transparency registry
+extract. Distinct from corporate parent **Ownership Relationship** (LEI Level 2)
+and from **Representation Relationship** (authorized signers).
+
+## Beneficial Ownership Relationship
+
+A regulated relationship asserting that a **Natural Person** is a beneficial
+owner of a **Legal Entity** or **Organization** customer under a stated
+jurisdictional scope (e.g., US FinCEN CDD, EU AMLD, FATF R24).
+
+Recommended metadata:
+
+- `ownership_prong` — meets equity threshold (e.g., 25%+).
+- `control_prong` — meets substantial control/management test.
+- `equity_percentage` — when ownership prong applies.
+- `control_basis` — role basis when control prong applies (e.g., CEO, managing member).
+- `intermediary_chain` — trust or entity look-through when required.
+- `regulatory_basis` — CDD Rule, national statute, or registry filing type.
+- `scope`, `evidence_reference`, `lifecycle_state`.
+
+Do not model as an Ownership subtype. Operational ownership (records, tenants,
+resources, corporate parents) uses **Ownership Relationship** separately.
 
 ## Customer