Surface all errors: wrap event handlers in try/catch with console.error

- domAddListener wraps callbacks so exceptions always log to console
- Add "sx:route trying <url>" log before tryClientRoute call
- Remove redundant bind-event fired log (replaced with route-specific logs)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

shared/sx/ref/bootstrap_js.py

@@ -2514,7 +2514,9 @@ PLATFORM_ORCHESTRATION_JS = """
     if (opts && !isNil(opts)) {
       if (opts.once || opts["once"]) o.once = true;
     }
-    el.addEventListener(event, fn, o);
+    el.addEventListener(event, function(e) {
+      try { fn(e); } catch (err) { console.error("[sx-ref] event handler error:", event, err); }
+    }, o);
   }
 
   // --- Validation ---