docs(readme): add SPDX header and/or standard badges

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: hyperpolymath

README.adoc

@@ -1,9 +1,14 @@
 // SPDX-License-Identifier: AGPL-3.0-or-later
 // SPDX-FileCopyrightText: 2026 Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>
+
 = NatSci Studio
 :toc:
 :toc-placement: preamble
 
+image:https://img.shields.io/badge/OpenSSF-Best_Practices-green?logo=opensourcesecurity[OpenSSF Best Practices,link="https://www.bestpractices.dev/en/projects/new?repo_url=https://github.com/hyperpolymath/natsci-studio"]
+image:https://img.shields.io/badge/License-AGPL_v3-blue.svg[License: AGPL-3.0]
+image:https://api.thegreenwebfoundation.org/greencheckimage/github.com[Green Web,link="https://www.thegreenwebfoundation.org/green-web-check/?url=github.com"]
+
 A standards-compliant monorepo of natural-sciences libraries with a
 Haskell-backed console (NatTrans Console) for minting, verifying, and
 observing scientific modules. Educational / research toolkit. Not a