Merge pull request #546 from KooshaPari/chore/add-pinned-refs-readme-2026-04-27

docs: add pinned references header to README

Author: KooshaPari

README.md

@@ -1,3 +1,10 @@
+> **Pinned references (Phenotype-org)**
+> - MSRV: see rust-toolchain.toml
+> - cargo-deny config: see deny.toml
+> - cargo-audit: rustsec/audit-check@v2 weekly
+> - Branch protection: 1 reviewer required, no force-push
+> - Authority: phenotype-org-governance/SUPERSEDED.md
+
 <!-- PHENOTYPE FORK CONTEXT — see "About this fork" below -->
 
 ## About this fork