docs: add TOPOLOGY.md

Author: hyperpolymath

TOPOLOGY.md

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+<!-- SPDX-License-Identifier: PMPL-1.0-or-later -->
+<!-- Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk> -->
+# TOPOLOGY.md — a2ml-showcase
+
+## Purpose
+
+Content showcase for A2ML (AI Attestation Markup Language): example documents, templates, and rendered output demonstrating A2ML format capabilities. No executable code — pure content and documentation repo. Generated output is produced by the Deno renderer via `just render`.
+
+## Module Map
+
+```
+a2ml-showcase/
+├── content/       # A2ML source documents (examples, templates)
+├── output/        # Rendered output (HTML, text)
+├── deno.json      # Deno task runner config
+└── template.html  # HTML rendering template
+```
+
+## Data Flow
+
+```
+[content/*.a2ml] ──► [a2ml-deno renderer] ──► [output/]
+```