fix(architecture): interactive diagram SVG click handler timing issues

Fixed non-responsive service node clicks on architecture.html interactive diagram.

Root cause: SVG loaded via <object> tag had contentDocument timing issues -
event listeners attached before SVG fully accessible.

Solution:
- Added retry mechanism for contentDocument access (100ms intervals)
- Implemented multiple loading strategies (immediate, load event, timeout)
- Enabled event capturing phase (addEventListener 3rd param: true)
- Enhanced logging for debugging click event flow
- Auto-display overview panel on initialization
- CSP-compliant cursor styling via JavaScript

Deployed to production: https://agenticgovernance.digital/architecture.html

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

public/js/components/interactive-diagram.js

@@ -133,11 +133,13 @@ class InteractiveDiagram {
       return;
     }
 
-    // Wait for object to load
+    // Wait for object to load with retry mechanism
     const initializeSVG = () => {
       const svgDoc = objectElement.contentDocument;
       if (!svgDoc) {
-        console.warn('[InteractiveDiagram] Could not access SVG contentDocument');
+        console.warn('[InteractiveDiagram] Could not access SVG contentDocument, retrying...');
+        // Retry after a short delay
+        setTimeout(initializeSVG, 100);
         return;
       }
 
@@ -168,13 +170,22 @@ class InteractiveDiagram {
       const nodes = svg.querySelectorAll('.service-node');
       console.log(`[InteractiveDiagram] Found ${nodes.length} service nodes`);
 
+      if (nodes.length === 0) {
+        console.warn('[InteractiveDiagram] No service nodes found in SVG');
+        return;
+      }
+
       nodes.forEach(node => {
         const serviceId = node.getAttribute('data-service');
+        console.log(`[InteractiveDiagram] Attaching listeners to service: ${serviceId}`);
 
+        // Use event capturing to ensure events are caught
         node.addEventListener('click', (e) => {
           e.preventDefault();
+          e.stopPropagation();
+          console.log(`[InteractiveDiagram] Clicked service: ${serviceId}`);
           this.showServiceDetails(serviceId);
-        });
+        }, true);
 
         node.addEventListener('mouseenter', () => {
           this.highlightService(serviceId);
@@ -183,17 +194,33 @@ class InteractiveDiagram {
         node.addEventListener('mouseleave', () => {
           this.unhighlightService(serviceId);
         });
+
+        // Add pointer cursor via JavaScript (CSP-compliant)
+        node.style.cursor = 'pointer';
       });
 
       this.addKeyboardNavigation(nodes);
+
+      // Show initial state (overview)
+      this.showServiceDetails('overview');
+      console.log('[InteractiveDiagram] Setup complete, showing overview');
     };
 
-    // If object already loaded, initialize immediately
-    if (objectElement.contentDocument) {
+    // Try multiple approaches to ensure SVG loads
+    if (objectElement.contentDocument && objectElement.contentDocument.readyState === 'complete') {
+      // Object already loaded and ready
+      console.log('[InteractiveDiagram] Object already loaded, initializing immediately');
       initializeSVG();
     } else {
-      // Otherwise wait for load event
-      objectElement.addEventListener('load', initializeSVG);
+      // Wait for load event
+      console.log('[InteractiveDiagram] Waiting for object to load...');
+      objectElement.addEventListener('load', () => {
+        console.log('[InteractiveDiagram] Object loaded event fired');
+        initializeSVG();
+      });
+
+      // Also try after a short delay as fallback
+      setTimeout(initializeSVG, 500);
     }
   }