Add: Advanced diagnostic tools for production debugging

New Diagnostic Endpoints:
- /test-simulation: Full simulation flow testing
- /api/test-websocket: WebSocket connectivity testing

Enhanced Browser Testing:
- testWebSocket(): Test real-time communication
- testDistributionChart(): Enhanced chart diagnostics
- WebSocket test message handler for live testing

Debugging Improvements:
- Real-time WebSocket message testing
- Manual chart update testing
- Complete simulation data flow validation
- End-to-end connectivity verification

These tools will help identify the exact failure point
in the wealth distribution histogram issue.

app/static/js/simulation.js

@@ -1,3 +1,26 @@
+/**
+ * Test WebSocket connectivity and chart update
+ * Call from browser console: testWebSocket()
+ */
+window.testWebSocket = async function() {
+    debugLog('=== WEBSOCKET CONNECTIVITY TEST ===');
+    
+    try {
+        const response = await fetch('/api/test-websocket');
+        const result = await response.json();
+        debugLog('WebSocket test API response', result);
+        
+        if (result.status === 'success') {
+            debugLog('✅ WebSocket test message sent from server');
+            debugLog('Wait for incoming WebSocket message...');
+        } else {
+            debugLog('❌ WebSocket test API failed', result);
+        }
+    } catch (error) {
+        debugLog('❌ WebSocket test API error', error);
+    }
+};
+
 /**
  * Production debugging test function
  * Call from browser console: testDistributionChart()
@@ -458,6 +481,23 @@ function initializeRealtimeUpdates() {
         }
     });
     
+    // WebSocket test handler
+    socket.on('websocket_test', function(data) {
+        debugLog('WebSocket test message received', data);
+        
+        // Test updating the distribution chart with test data
+        if (charts.distribution && data.distribution) {
+            try {
+                charts.distribution.data.labels = data.distribution.labels;
+                charts.distribution.data.datasets[0].data = data.distribution.counts;
+                charts.distribution.update();
+                debugLog('✅ WebSocket test: Chart updated successfully with test data');
+            } catch (error) {
+                debugLog('❌ WebSocket test: Chart update failed', error);
+            }
+        }
+    });
+    
     // Simulation progress updates
     socket.on('simulation_progress', function(data) {
         debugLog('Received real-time progress update');