Undo data-context.ts changes, because after google#1179 the workaround is no longer needed

Author: josemontespg

renderers/web_core/src/v0_9/rendering/data-context.ts

@@ -360,12 +360,10 @@ export class DataContext {
   }
 
   private resolvePath(path: string): string {
-    // In A2UI v0.9, all paths generated by the prompt-first LLM must begin with a leading `/`
-    // to satisfy RFC 6901 JSON Pointer validation.
-    // Thus, paths like `/imageUrl` are effectively relative to this DataContext.
-    const relPath = path.startsWith('/') ? path.substring(1) : path;
-
-    if (relPath === '' || relPath === '.') {
+    if (path.startsWith('/')) {
+      return path;
+    }
+    if (path === '' || path === '.') {
       return this.path;
     }
 
@@ -375,6 +373,6 @@ export class DataContext {
     }
     if (base === '/') base = '';
 
-    return `${base}/${relPath}`;
+    return `${base}/${path}`;
   }
 }