marketing: add Research & Engineering blog

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@@ -64,6 +64,6 @@ <h3>Why fixed token caps are not enough</h3><p>A budget cap can stop a run after
 <p>Install MARGINAL in Shadow Mode, inspect what your agent actually repeats, and contribute traces that make the governor harder to fool.</p>
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+<section class="section"><div class="shell reach-callout"><h3>Deep dive: detect no-progress without reading prompts</h3><p>The Research &amp; Engineering article explains the evidence model, privacy boundary, counterexamples and why repetition alone is not enough.</p><div class="hero-actions"><a class="button secondary" href="../blog/detecting-no-progress-without-reading-prompts/">Read the technical article →</a></div></div></section></main>
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