Add sponsor badge

Author: hyperpolymath

README.md

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+[![Sponsor](https://img.shields.io/badge/Sponsor-%E2%9D%A4-pink?logo=github)](https://github.com/sponsors/hyperpolymath)
+
+// SPDX-License-Identifier: MPL-2.0
+// SPDX-FileCopyrightText: 2025-2026 Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>
+
+= casket-ssg
+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/casket-ssg"]
+image:https://img.shields.io/badge/License-PMPL--1.0-blue.svg[License: PMPL-1.0,link="https://github.com/hyperpolymath/palimpsest-license"]
+image:https://api.thegreenwebfoundation.org/greencheckimage/github.com[Green Web,link="https://www.thegreenwebfoundation.org/green-web-check/?url=github.com"]
+
+
+
+
+image:https://img.shields.io/badge/Philosophy-Palimpsest-indigo.svg[Palimpsest,link="https://github.com/hyperpolymath/palimpsest-license"]
+
+
+:toc: auto
+:toclevels: 2
+
+image:https://img.shields.io/badge/RSR-compliant-gold[RSR Compliant,link=https://github.com/hyperpolymath/rhodium-standard-repositories]
+
+**Pure functional static site generator in Haskell.**
+
+== Who Is This For?
+
+* **Haskell developers** who want to build sites with tools they know and love
+* **Functional programming enthusiasts** who appreciate compositional design
+* **Teams requiring reliability** where type safety prevents runtime surprises
+* **Anyone frustrated** by dynamic language site builders that fail at deploy time
+
+== Why casket-ssg?
+
+=== Type Safety That Matters
+
+Your site structure is checked at compile time. Missing templates, broken links, malformed frontmatter - all caught before deployment, not discovered by users.
+
+=== Composable Pipelines
+
+Content transformations compose like functions should. Chain markdown processing, templating, and asset handling with confidence that types align.
+
+=== Lazy Large-Site Builds
+
+Haskell's lazy evaluation means casket-ssg only processes what's needed. Incremental builds are natural, not bolted on.
+
+=== Pandoc Integration
+
+Best-in-class document conversion with full Pandoc support. Markdown, reStructuredText, Org-mode - your content, your format.
+
+== Quick Start
+
+[source,bash]
+----
+# Install
+cabal update
+cabal install casket-ssg
+
+# Create a site
+casket-ssg init my-site
+cd my-site
+
+# Build
+casket-ssg build
+
+# Preview locally
+casket-ssg serve
+----
+
+== Features
+
+* **Compile-time template validation** - broken templates don't build
+* **Strong frontmatter types** - YAML parsing with schema enforcement
+* **Asset pipeline** - CSS/JS processing with hash-based cache busting
+* **Incremental builds** - only rebuild what changed
+* **Live reload** - instant preview during development
+* **RSS/Atom feeds** - generated automatically from content
+* **Sitemap generation** - SEO-ready output
+
+== Requirements
+
+* GHC 9.0 or later
+* Cabal 3.0 or Stack 2.0
+
+== Part of poly-ssg
+
+casket-ssg is part of the https://github.com/hyperpolymath/poly-ssg[poly-ssg] family of language-native static site generators, unified through https://github.com/hyperpolymath/poly-ssg-mcp[MCP integration].
+
+== License
+
+MPL-2.0