feat: add post-quantum cryptographic primitives module

- Add Crypto.php with high-security primitives:
  - SHAKE3-256 (SHA-3 XOF)
  - BLAKE3 (fast hash, falls back to BLAKE2b)
  - Argon2id (memory-hard password hashing, 64MiB minimum)
  - Ed448 (Edwards curve signatures)
  - Kyber-1024 (post-quantum key encapsulation)
  - Dilithium (post-quantum signatures)
- Add DUBLINCORE.rdf, CITATION.cff, void.ttl metadata
- Add PRIORITY.adoc (MUST/SHOULD/COULD list)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Jonathan D.A. Jewell

CITATION.cff

@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: MPL-2.0
+cff-version: 1.2.0
+title: php-aegis
+message: "If you use this software, please cite it as below."
+type: software
+authors:
+  - family-names: Jewell
+    given-names: Jonathan D.A.
+repository-code: "https://github.com/hyperpolymath/php-aegis"
+url: "https://github.com/hyperpolymath/php-aegis"
+abstract: >-
+  PHP security and hardening toolkit providing input validation,
+  context-aware sanitization, security headers, and W3C-compliant
+  RDF/Turtle escaping for semantic web applications.
+keywords:
+  - php
+  - security
+  - validation
+  - sanitization
+  - rdf
+  - turtle
+  - semantic-web
+license: MPL-2.0
+version: "0.2.0"
+date-released: "2025-01-03"

DUBLINCORE.rdf

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+<?xml version="1.0" encoding="UTF-8"?>
+<!-- SPDX-License-Identifier: MPL-2.0 -->
+<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+         xmlns:dc="http://purl.org/dc/elements/1.1/"
+         xmlns:dcterms="http://purl.org/dc/terms/">
+  <rdf:Description rdf:about="https://github.com/hyperpolymath/php-aegis">
+    <dc:title>php-aegis</dc:title>
+    <dc:creator>Jonathan D.A. Jewell</dc:creator>
+    <dc:subject>PHP Security</dc:subject>
+    <dc:subject>Input Validation</dc:subject>
+    <dc:subject>Output Sanitization</dc:subject>
+    <dc:subject>Web Security</dc:subject>
+    <dc:description>PHP security and hardening toolkit with input validation, sanitization, security headers, and RDF/Turtle escaping</dc:description>
+    <dc:publisher>Hyperpolymath</dc:publisher>
+    <dc:type>Software</dc:type>
+    <dc:format>application/x-php</dc:format>
+    <dc:identifier>https://github.com/hyperpolymath/php-aegis</dc:identifier>
+    <dc:language>en</dc:language>
+    <dc:rights>MPL-2.0</dc:rights>
+    <dcterms:license rdf:resource="https://opensource.org/licenses/MPL-2.0"/>
+    <dcterms:conformsTo rdf:resource="https://github.com/hyperpolymath/rhodium-standard-repositories"/>
+  </rdf:Description>
+</rdf:RDF>

PRIORITY.adoc

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+// SPDX-License-Identifier: MPL-2.0
+= php-aegis Priority List
+:toc:
+
+== MUST (Critical - Security Library Core)
+
+[cols="1,3,1"]
+|===
+|ID |Task |Status
+
+|M1
+|Post-quantum crypto module (SHAKE3-256, BLAKE3, Kyber, Dilithium, Argon2id, Ed448)
+|✓ DONE
+
+|M2
+|Complete input validation test coverage
+|PENDING
+
+|M3
+|Security headers comprehensive tests
+|PENDING
+
+|M4
+|RDF/Turtle escaping edge case tests
+|PENDING
+|===
+
+== SHOULD (Important - High Value)
+
+[cols="1,3,1"]
+|===
+|ID |Task |Status
+
+|S1
+|IndieWeb security helpers (Micropub, IndieAuth, Webmention)
+|PENDING
+
+|S2
+|Rate limiting with file/memory backends
+|PENDING
+
+|S3
+|CSRF token generation and validation
+|PENDING
+
+|S4
+|Input filtering chains (composable validators)
+|PENDING
+
+|S5
+|Integration with sanctify-php static analysis
+|PENDING
+
+|S6
+|Add Guix/Nix package definitions
+|PENDING
+|===
+
+== COULD (Nice to Have - Future)
+
+[cols="1,3,1"]
+|===
+|ID |Task |Status
+
+|C1
+|OpenID Connect validation helpers
+|PENDING
+
+|C2
+|FIDO2/WebAuthn integration
+|PENDING
+
+|C3
+|Content Security Policy builder
+|PENDING
+
+|C4
+|Subresource Integrity (SRI) helpers
+|PENDING
+|===