docs: update license from AGPL to PMPL

- Replace AGPL-3.0-or-later with PMPL-1.0-or-later
- Update license name and URLs
- Align with palimpsest-license standard

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

Author: Your Name

README.adoc

@@ -2,7 +2,7 @@ image:https://img.shields.io/badge/License-MPL_2.0-blue.svg[MPL-2.0,link="https:
 image:https://img.shields.io/badge/Philosophy-Palimpsest-purple.svg[Palimpsest,link="https://github.com/hyperpolymath/palimpsest-licence"]
 
 
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: PMPL-1.0-or-later
 // SPDX-FileCopyrightText: 2025 Jonathan D.A. Jewell
 
 = Poly SSG
@@ -135,6 +135,6 @@ See link:docs/ADDING-ENGINE.md[ADDING-ENGINE.md] for the contract specification
 
 == License
 
-AGPL-3.0-or-later
+PMPL-1.0-or-later
 
 This ensures all paradigmatic implementations remain open. Your site content is yours; the tools stay free.