chore: add missing RSR standard files (LICENSE, SECURITY.md, tests/)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

LICENSE

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+Palimpsest License (PMPL-1.0-or-later)
+
+Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath)
+
+This work is licensed under the Palimpsest License, version 1.0 or later.
+
+See https://github.com/hyperpolymath/palimpsest-license for the full
+license text.

README.adoc

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+// SPDX-License-Identifier: PMPL-1.0-or-later
+// Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath)
+
+= a2ml-showcase
+
+Showcase examples and templates for A2ML (AI Attestation Markup Language).
+
+image:https://api.securityscorecards.dev/projects/github.com/hyperpolymath/a2ml-showcase/badge[OpenSSF Scorecard,link=https://securityscorecards.dev/viewer/?uri=github.com/hyperpolymath/a2ml-showcase]
+
+== About
+
+This repository contains example A2ML documents, templates, and rendered output
+demonstrating the capabilities of the A2ML format. It is a content/showcase
+repository -- there is no executable code.
+
+== Structure
+
+* `content/` -- A2ML source documents
+* `output/` -- Rendered output
+* `template.html` -- HTML rendering template
+
+== License
+
+PMPL-1.0-or-later. See link:LICENSE[LICENSE].

SECURITY.md

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+<!-- SPDX-License-Identifier: PMPL-1.0-or-later -->
+<!-- Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) -->
+
+# Security Policy
+
+## Reporting a Vulnerability
+
+Please report security vulnerabilities to j.d.a.jewell@open.ac.uk.
+
+We will acknowledge receipt within 48 hours and provide a detailed response within 7 days.
+
+## Supported Versions
+
+| Version | Supported |
+|---------|-----------|
+| Latest  | Yes       |

tests/README.md

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+<!-- SPDX-License-Identifier: PMPL-1.0-or-later -->
+
+# Tests
+
+This is a showcase/content repository for A2ML examples. There is no executable
+code to test.
+
+The `fuzz/` directory contains placeholder structure for OpenSSF compliance.