docs: add TOPOLOGY.md

Author: hyperpolymath

TOPOLOGY.md

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+<!-- SPDX-License-Identifier: MPL-2.0-or-later -->
+<!-- Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk> -->
+
+# TOPOLOGY.md — reasonably-good-token-vault
+
+## Purpose
+
+Post-quantum secure identity vault for SSH keys, API tokens, PGP keys, and digital credentials. Open source and formally verified with protection against future quantum computers via lattice-based cryptography. Provides unified credential management with compliance, encryption at rest, and audit logging for hyperpolymath infrastructure.
+
+## Module Map
+
+```
+reasonably-good-token-vault/
+├── src/                 # Core vault implementation
+│   ├── crypto/         # Quantum-safe cryptography (lattice-based)
+│   ├── storage/        # Encrypted credential storage
+│   ├── identity/       # Identity management and verification
+│   └── audit/          # Compliance and audit logging
+├── tests/              # Security test suite
+├── docs/               # Vault architecture and usage
+└── Cargo.toml          # Rust package manifest
+```
+
+## Data Flow
+
+```
+[Credential Input] ──► [Lattice-Based Encryption] ──► [Storage] ──► [Encrypted at Rest]
+                                                           ↓
+                                                    [Audit Log] ──► [Compliance]
+```
+
+## Security Properties
+
+- **Post-quantum**: Resistant to quantum computer attacks
+- **Formally verified**: Cryptographic proofs of correctness
+- **Isolation**: Memory-safe Rust implementation
+- **Compliance**: Audit trails for regulatory requirements