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Add rule-engine to the catalogue
Add a rule-engine project card (JVM forward-chaining rules engine) after mini-auth, ordered fourth. Renumber the catalogue to five projects and refresh the section copy and meta description. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017N2zZauXsFAj8hBRfBxFez
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‎index.html‎

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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>Codehead Systems — open source by Ned Wolpert</title>
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<meta name="description" content="An open-source workshop of cryptography, authentication, and infrastructure libraries by engineer Ned Wolpert. Featuring pk-auth, mini-auth (a teachable identity suite), the Hofmann Elimination (OPAQUE PAKE), and a collection of JVM utilities." />
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<meta name="description" content="An open-source workshop of cryptography, authentication, decision logic, and infrastructure libraries by engineer Ned Wolpert. Featuring pk-auth, mini-auth (a teachable identity suite), the Hofmann Elimination (OPAQUE PAKE), rule-engine (a forward-chaining rules engine for the JVM), and a collection of JVM utilities." />
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<meta name="theme-color" content="#0B0B0D" />
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<section id="projects" class="projects">
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<header class="section-head">
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<span class="mono-tiny">§&nbsp;THE&nbsp;CATALOGUE</span>
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<h2 class="section-head__title">Four corners of the workshop.</h2>
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<h2 class="section-head__title">Five corners of the workshop.</h2>
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<p class="section-head__lede">
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The most recent four projects, each with its own discipline — passkeys, password-less
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cryptography, a teachable identity suite, and the small Java tools
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in between.
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The most recent five projects, each with its own discipline — passkeys, password-less
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cryptography, a teachable identity suite, deterministic decision
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logic, and the small Java tools in between.
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</p>
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</header>
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</div>
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</article>
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<!-- ─── 04 · Libraries ─── -->
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<!-- ─── 04 · rule-engine ─── -->
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<article class="project">
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<header class="project__rail">
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<span class="mono-tiny">PROJECT</span>
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<span class="project__num" aria-hidden="true">04</span>
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<span class="mono-tiny project__rail-tag">D&nbsp;–&nbsp;UTILS</span>
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<span class="mono-tiny project__rail-tag">D&nbsp;–&nbsp;RULES</span>
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</header>
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<div class="project__body">
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<div class="project__heading">
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<h3 class="project__title">rule-engine</h3>
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<span class="project__kicker mono-tiny">rete · yaml / json · deterministic</span>
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</div>
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<p class="project__lede">
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A forward-chaining rule engine for services where the rules
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change more often than the code&nbsp;deploys.
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</p>
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<p class="project__text">
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An in-process, JVM rule engine that replaces nested conditionals
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with declarative rules written in YAML or JSON, validated against
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a published schema, and compiled once at startup into an
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immutable, thread-safe structure. The same facts in the same
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order produce the same firings, on any host, in any year, because
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the engine owns no clock — decisions stay explainable and
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reproducible long after they're made.
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</p>
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<ol class="sub-list">
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<li>
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<div class="sub-list__row">
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<span class="sub-list__name">rule-engine-core</span>
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<a href="https://github.com/codeheadsystems/rule-engine/tree/main/rule-engine-core" class="sub-list__link mono-tiny">view&nbsp;→</a>
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</div>
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<p class="sub-list__note">Working memory, matchers, and session management.</p>
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</li>
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<li>
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<div class="sub-list__row">
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<span class="sub-list__name">rule-engine-compiler</span>
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<a href="https://github.com/codeheadsystems/rule-engine/tree/main/rule-engine-compiler" class="sub-list__link mono-tiny">view&nbsp;→</a>
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</div>
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<p class="sub-list__note">Rule validation and network compilation.</p>
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</li>
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<li>
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<div class="sub-list__row">
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<span class="sub-list__name">rule-engine-dsl</span>
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<a href="https://github.com/codeheadsystems/rule-engine/tree/main/rule-engine-dsl" class="sub-list__link mono-tiny">view&nbsp;→</a>
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</div>
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<p class="sub-list__note">YAML / JSON rule-file parsing — the recommended entry point.</p>
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</li>
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<li>
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<div class="sub-list__row">
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<span class="sub-list__name">rule-engine-cel</span>
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<a href="https://github.com/codeheadsystems/rule-engine/tree/main/rule-engine-cel" class="sub-list__link mono-tiny">view&nbsp;→</a>
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</div>
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<p class="sub-list__note">Optional Common Expression Language integration.</p>
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</li>
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<li>
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<div class="sub-list__row">
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<span class="sub-list__name">rule-engine-schema</span>
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<a href="https://github.com/codeheadsystems/rule-engine/tree/main/rule-engine-schema" class="sub-list__link mono-tiny">view&nbsp;→</a>
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</div>
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<p class="sub-list__note">Optional fact schema validation.</p>
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</li>
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<li>
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<div class="sub-list__row">
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<span class="sub-list__name">rule-engine-observability</span>
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<a href="https://github.com/codeheadsystems/rule-engine/tree/main/rule-engine-observability" class="sub-list__link mono-tiny">view&nbsp;→</a>
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</div>
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<p class="sub-list__note">Tracing, diagnostics, and match explanation.</p>
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</li>
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<li>
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<div class="sub-list__row">
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<span class="sub-list__name">rule-engine-testkit</span>
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<a href="https://github.com/codeheadsystems/rule-engine/tree/main/rule-engine-testkit" class="sub-list__link mono-tiny">view&nbsp;→</a>
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</div>
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<p class="sub-list__note">Test fixtures and verification harnesses.</p>
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</li>
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</ol>
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<p class="project__text">
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Pattern matching supports joins, negation (<code>notExists</code>),
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universal quantification (<code>forAll</code>), and aggregations
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(<code>accumulate</code>) as first-class constructs. Three
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independent matchers — a naive oracle, an indexed Rete-style
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network, and a streaming matcher — are required to agree on
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identical firing sequences.
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</p>
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<ul class="chips">
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<li>Java 25</li><li>Gradle</li><li>Jackson 3</li><li>Rete</li><li>CEL</li><li>JSON Schema</li>
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</ul>
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<div class="project__links">
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<a class="link-arrow link-arrow--lead" href="https://codeheadsystems.github.io/rule-engine/">
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<span>visit the project site</span><span class="link-arrow__icon">↗</span>
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</a>
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<a class="link-arrow" href="https://github.com/codeheadsystems/rule-engine">
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<span>view source</span><span class="link-arrow__icon">↗</span>
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</a>
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</div>
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</div>
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</article>
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<!-- ─── 05 · Libraries ─── -->
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<article class="project">
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<header class="project__rail">
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<span class="mono-tiny">PROJECT</span>
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<span class="project__num" aria-hidden="true">05</span>
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<span class="mono-tiny project__rail-tag">E&nbsp;–&nbsp;UTILS</span>
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</header>
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<div class="project__body">

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