add Aether family section (7Attn, 11Attn, checkpoints, blog)

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+  <div class="card">
+    <h2>The Aether family</h2>
+    <p class="muted">One architecture line, released at different levels of openness.</p>
+    <ul>
+      <li><b><a href="https://huggingface.co/FINAL-Bench/Aether-7B-5Attn">Aether-7B-5Attn</a></b> — base, <b>fully open</b>: weights + data recipe + training code + complete logs + intermediate checkpoints.</li>
+      <li><b><a href="https://huggingface.co/FINAL-Bench/Aether-7B-5Attn-it">Aether-7B-5Attn-it</a></b> — instruction-tuned. This is the model answering in the demo above.</li>
+      <li><b><a href="https://huggingface.co/FINAL-Bench/Aether-7B-7Attn-base">Aether-7B-7Attn-base</a></b> — open weights.</li>
+      <li><b><a href="https://huggingface.co/FINAL-Bench/Aether-6B-11Attn">Aether-6B-11Attn</a></b> — open weights. 121 layers place <b>11 heterogeneous sequence-mixing mechanisms</b> — attention, state-space (Mamba2), convolutional (Hyena) and linear families — on an <b>11×11 Latin square</b>.</li>
+      <li><a href="https://huggingface.co/datasets/FINAL-Bench/Aether-7B-5Attn-checkpoints">Intermediate checkpoints</a> (110k · 115k · 162k) · <a href="https://huggingface.co/blog/FINAL-Bench/opensource-llm">Blog write-up</a> · <a href="https://huggingface.co/collections/FINAL-Bench/aether-foundation-model">Collection</a></li>
+    </ul>
+  </div>
+
   <div class="card qa">
     <h2>Answers</h2>
     <h3>Is Aether open source?</h3>