fix(website/bench): show LLVM in tiered method line

The header method strip listed "BC interp → opt → Cranelift JIT"
but the page already renders a fourth tier (zyntax-tiered-llvm)
when results.json carries it. Add the LLVM step so the method
chip matches the rendered tier ladder end-to-end.

Author: darmie

website/benchmark/index.html

@@ -450,7 +450,7 @@ <h1>What does <em>each tier</em> cost?</h1>
       <span><svg viewBox="0 0 24 24"><path d="M5 13l4 4L19 7"/></svg><b>Median of 9</b> · 3 warmup runs discarded</span>
       <span><svg viewBox="0 0 24 24"><circle cx="12" cy="12" r="9"/><path d="M12 7v5l3 3"/></svg><b>Wall-clock</b> · compile + execute timed separately</span>
       <span><svg viewBox="0 0 24 24"><path d="M4 6h16M4 12h16M4 18h10"/></svg><b>Result pinned</b> · output checked every run</span>
-      <span><svg viewBox="0 0 24 24"><path d="M3 12h4l3-9 4 18 3-9h4"/></svg><b>Tiered</b> · BC interp → opt → Cranelift JIT</span>
+      <span><svg viewBox="0 0 24 24"><path d="M3 12h4l3-9 4 18 3-9h4"/></svg><b>Tiered</b> · BC interp → opt → Cranelift JIT → LLVM</span>
     </div>
   </section>