fix(assets): replace hero brand mark with website coral circuit mark (#2232)

* fix(assets): replace hero brand mark with website coral circuit mark

The top-left mark in the hero banner was the assets/ecc-icon.svg double-E
lettermark, not the actual brand logo. Swap in the coral vector circuit
mark from the ECC-website header (src/styles/brandMarks.ts), keeping the
~70px footprint, the soft coral glow, and every other element identical.
PNG re-rendered at 2400x1350 via sharp with palette compression.

* docs: sync skill count to 262 across catalog surfaces

catalog:check was failing on main after config-gc (#2216) landed without
a count bump. Ran npm run catalog:sync.

assets/hero.svg

@@ -5,6 +5,14 @@
     <stop offset="0" stop-color="rgba(217,119,87,0.16)"/>
     <stop offset="1" stop-color="rgba(217,119,87,0)"/>
   </radialGradient>
+  <linearGradient id="markFrame" x1="18" y1="14" x2="82" y2="86" gradientUnits="userSpaceOnUse">
+    <stop stop-color="#E07856"/>
+    <stop offset="1" stop-color="#ffd700"/>
+  </linearGradient>
+  <linearGradient id="markNode" x1="24" y1="24" x2="72" y2="72" gradientUnits="userSpaceOnUse">
+    <stop stop-color="#ffd700"/>
+    <stop offset="1" stop-color="#7ee787"/>
+  </linearGradient>
   <linearGradient id="cardFade" x1="0" y1="0" x2="0" y2="1">
     <stop offset="0" stop-color="rgba(12,10,7,0)"/>
     <stop offset="0.55" stop-color="rgba(12,10,7,0.82)"/>
@@ -21,7 +29,7 @@
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