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 — HyperpolymathRegistry
+
+## Purpose
+
+Custom Julia package registry aggregating all hyperpolymath Julia packages. Provides unified package index, dependency resolution, and installation for post-disciplinary research, formal verification, and verified computing libraries.
+
+## Module Map
+
+```
+HyperpolymathRegistry/
+├── Registries.toml            # Registry configuration
+├── A/
+│   └── ... (packages starting with A)
+├── B/
+│   └── ... (packages starting with B)
+├── ... (alphabetical package directories)
+├── README.adoc                # Registry documentation
+└── LICENSE                    # PMPL-1.0-or-later
+```
+
+## Data Flow
+
+```
+[Hyperpolymath Julia Packages] ──► [Registry Index] ──► [Pkg.Registry.add()] ──► [Local Environment]
+```
+
+## Key Invariants
+
+- Julia package registry format with standard Registries.toml
+- All registered packages use PMPL-1.0-or-later or compatible licenses
+- Compatible with standard Julia package manager (Pkg)
+- Version resolution follows semantic versioning