Extracted from ../entities/reference-rate.md.
- v0.2 — BR-review decisions (2026-04-15): Reference Rate versioning LOCKED (no versioning; edits overwrite); historical comparison CLARIFIED (Layer 3 AI distinct mechanism, not Reference Rate feature). Updated §1, §2 (Purpose), §6 (Business Rules) to reinforce manual, non-versioned nature and separate Layer 3 AI mechanism.
- v0.1 — initial draft (Batch B). Consolidates BR-144–146, glossary §9 (Reference Rate), domain-model Layer 5 (Reference Rate) entry. Adds validation invariants, two-tier matching logic (rules-first Alpha + AI-assist Release), three worked examples. Admin-managed lifecycle. Phase: Alpha (BR-145) + Release (BR-146).