Tighten Stack: five layers (L0–L4), less scroll and spacing.

Merge contact and ops into L4 surface; static footer; narrower cards and smaller offsets.

Co-authored-by: Cursor <cursoragent@cursor.com>

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@@ -214,7 +214,7 @@
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         <div class="card-body">
           <h2>Stack</h2>
-          <p>Scroll through layers — L0 foundation to L6 interface. Services as a literal stack of cards.</p>
+          <p>Sticky card stack L0–L4. Scroll peels layers back — tight, architectural, no bloat.</p>
           <span class="tag">layers · scroll · architectural</span>
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