docs(readme): convert README.adoc -> Markdown README.md

README must be real Markdown to render in GitHub community-health, the GitHub
profile, and external MCP directories (Glama) — AsciiDoc shows as raw markup
there. pandoc asciidoc->GFM, badges fixed to clickable, SPDX header kept as an
HTML comment, duplicate README.adoc removed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: hyperpolymath

README.adoc

@@ -1,63 +1,57 @@
-[![Sponsor](https://img.shields.io/badge/Sponsor-%E2%9D%A4-pink?logo=github)](https://github.com/sponsors/hyperpolymath)
+<!--
+SPDX-License-Identifier: CC-BY-SA-4.0 OR MPL-2.0
+SPDX-FileCopyrightText: 2025-2026 Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>
+-->
 
-// SPDX-License-Identifier: CC-BY-SA-4.0 OR MPL-2.0
-// SPDX-FileCopyrightText: 2024-2025 hyperpolymath
-
-= Anvomidav
-
-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/anvomidav"]
+[![OpenSSF Best Practices](https://img.shields.io/badge/OpenSSF-Best_Practices-green?logo=opensourcesecurity)](https://www.bestpractices.dev/en/projects/new?repo_url=https://github.com/hyperpolymath/anvomidav)
 
 **The first programming language for choreographers of figure skating.**
 
-== Status
-
-[IMPORTANT]
-====
-This project is in the *concept phase*. The repository contains project infrastructure and governance documents, but no implementation yet. See link:ROADMAP.adoc[ROADMAP.adoc] for planned development.
-====
+# Status
 
-== Vision
+> [!IMPORTANT]
+> This project is in the **concept phase**. The repository contains
+> project infrastructure and governance documents, but no implementation
+> yet. See <a href="ROADMAP.adoc" class="adoc">ROADMAP</a> for planned
+> development.
 
-Anvomidav aims to provide figure skating choreographers with a domain-specific language (DSL) to:
+# Vision
 
-* **Notate** — Precisely describe skating elements, transitions, and sequences
-* **Compose** — Build complex programs from reusable choreographic patterns
-* **Validate** — Check technical compliance with ISU (International Skating Union) rules
-* **Visualize** — Generate rink diagrams, timing charts, and 3D previews
-* **Collaborate** — Share and version-control choreographic works
+Anvomidav aims to provide figure skating choreographers with a
+domain-specific language (DSL) to:
 
-== Name
+- **Notate** — Precisely describe skating elements, transitions, and
+  sequences
 
-_Anvomidav_ — etymology and meaning to be documented.
+- **Compose** — Build complex programs from reusable choreographic
+  patterns
 
-== Technology Stack
+- **Validate** — Check technical compliance with ISU (International
+  Skating Union) rules
 
-Per the link:.claude/CLAUDE.md[Hyperpolymath Standard]:
+- **Visualize** — Generate rink diagrams, timing charts, and 3D previews
 
-[cols="1,2"]
-|===
-| Component | Technology
+- **Collaborate** — Share and version-control choreographic works
 
-| Compiler/Interpreter
-| OCaml or Rust
+# Name
 
-| Runtime
-| Deno (if JS target) or native
+*Anvomidav* — etymology and meaning to be documented.
 
-| Editor Integration
-| LSP server (Rust)
+# Technology Stack
 
-| Visualization
-| ReScript + WebGL/Canvas
+Per the [Hyperpolymath Standard](.claude/CLAUDE.md):
 
-| Mobile Apps
-| Tauri 2.0+ or Dioxus
-|===
+| Component            | Technology                    |
+|----------------------|-------------------------------|
+| Compiler/Interpreter | OCaml or Rust                 |
+| Runtime              | Deno (if JS target) or native |
+| Editor Integration   | LSP server (Rust)             |
+| Visualization        | ReScript + WebGL/Canvas       |
+| Mobile Apps          | Tauri 2.0+ or Dioxus          |
 
-== Getting Started
+# Getting Started
 
-[source,bash]
-----
+```bash
 # Clone the repository
 git clone https://github.com/hyperpolymath/anvomidav.git
 cd anvomidav
@@ -66,21 +60,28 @@ cd anvomidav
 nix develop        # Nix users
 # or
 guix shell         # Guix users
-----
+```
+
+# Documentation
+
+- [Roadmap](ROADMAP.adoc) — Development phases and milestones
+
+- [Contributing](CONTRIBUTING.md) — How to participate
 
-== Documentation
+- [Security Policy](SECURITY.md) — Vulnerability reporting
 
-* link:ROADMAP.adoc[Roadmap] — Development phases and milestones
-* link:CONTRIBUTING.md[Contributing] — How to participate
-* link:SECURITY.md[Security Policy] — Vulnerability reporting
-* link:CODE_OF_CONDUCT.md[Code of Conduct] — Community standards
+- [Code of Conduct](CODE_OF_CONDUCT.md) — Community standards
 
-== License
+# License
 
-Dual-licensed under link:LICENSE.txt[MIT OR MPL-2.0]. Choose the license that best fits your use case.
+Dual-licensed under [MIT OR MPL-2.0](LICENSE.txt). Choose the license
+that best fits your use case.
 
-== Contributing
+# Contributing
 
-Contributions welcome! This project is in early stages — input on language design, figure skating domain expertise, and implementation help are all valuable.
+Contributions welcome! This project is in early stages — input on
+language design, figure skating domain expertise, and implementation
+help are all valuable.
 
-See link:CONTRIBUTING.md[CONTRIBUTING.md] for guidelines.
+See <a href="CONTRIBUTING.md" class="md">CONTRIBUTING</a> for
+guidelines.