Add architecture diagram to project page

Author: voidful

webpage/assets/architecture.png

@@ -821,14 +821,8 @@ <h2 class="section-title">How LLM-Codec Works</h2>
             </div>
 
             <div class="arch-figure">
-                
-                <div class="arch-placeholder">
-                    <div class="icon">&#x229E;</div>
-                    <p>Place architecture diagram here<br>
-                        <code
-                            style="font-size:12px;color:var(--text-muted)">&lt;img src="assets/architecture.png" alt="LLM-Codec Architecture"&gt;</code>
-                    </p>
-                </div>
+                <img src="assets/architecture.png"
+                    alt="LLM-Codec architecture diagram showing future token prediction and semantic alignment objectives">
             </div>
 
             <div class="method-cards">