docs: Add authentication and authorization audit report

This commit adds the AUDIT-AUTH.md file, which contains the results of a security audit focused on authentication and authorization.

The audit found that the Enchantrix codebase, being a data transformation and encryption library, does not contain any user authentication or authorization mechanisms. Therefore, the report concludes that the audit scope is not applicable.

Co-authored-by: Snider <631881+Snider@users.noreply.github.com>

AUDIT-AUTH.md

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+# Security Audit: Authentication & Authorization
+
+## Executive Summary
+
+This audit found that the Enchantrix codebase, in its current form, does not contain any user authentication or authorization mechanisms. The project is a data transformation and encryption library, supplemented by a command-line interface (`trix`), neither of which manages user identities, sessions, or access control.
+
+Therefore, the requested audit of authentication and authorization flows is **not applicable**.
+
+## Authentication Review
+
+### Password Handling
+- **Hashing Algorithm:** No password handling exists.
+- **Salt Usage:** Not applicable.
+- **Password Requirements:** Not applicable.
+- **Reset Flow Security:** Not applicable.
+
+### Session Management
+- **Session ID Generation:** No session management is implemented.
+- **Session Fixation Protection:** Not applicable.
+- **Timeout Policies:** Not applicable.
+- **Concurrent Session Handling:** Not applicable.
+
+### Token Security
+- **JWT Implementation:** No token-based authentication is used.
+- **Token Storage:** Not applicable.
+- **Refresh Token Rotation:** Not applicable.
+- **Token Revocation:** Not applicable.
+
+### Multi-factor Authentication
+- **MFA Implementation:** No multi-factor authentication is present.
+- **Bypass Vulnerabilities:** Not applicable.
+- **Recovery Codes:** Not applicable.
+
+## Authorization Review
+
+### Access Control Model
+- No access control model (RBAC, ABAC, ACL) is implemented.
+
+### Permission Checks
+- No permission checks exist.
+
+### Privilege Escalation
+- No user roles or privileges to escalate.
+
+### API Authorization
+- The project does not expose any user-facing APIs that would require authorization.
+
+### Resource Ownership
+- No concept of resource ownership by users.
+
+## Conclusion
+
+The audit scope is not applicable to the Enchantrix project. If user authentication and authorization features are added in the future, a new audit will be required.