Phase A.3 Complete - Integrate grades display into UI

index.html

@@ -92,6 +92,12 @@
                         </div>
                     </div>
                     
+                    <!-- Performance Grades -->
+                    <div id="performanceGrades" style="display: none; margin-top: 2rem;">
+                        <h3>Performance Grades</h3>
+                        <div id="gradesContainer"></div>
+                    </div>
+                    
                     <!-- Waterfall Link -->
                     <div style="margin-top: 1.5rem; display: none;" id="waterfall-link-container">
                         <a href="#" id="view-waterfall" class="button" style="display: inline-block; padding: 0.75rem 1.5rem; background: var(--color-accent); color: white; text-decoration: none; border-radius: 8px; font-weight: 600;">
@@ -160,6 +166,7 @@
     <!-- Git Badge Scripts global must be before main -->
     <script src="git-badge.js"></script>
     <script src="breakdown.js"></script>
+    <script src="grades.js"></script>
     <script src="main.js?v=4.0"></script>
 </body>