Revert "fix(schemav2validator): conditionally strip @context/@type based on schema properties"

The fix in the previous PR is no longer required because the protocol is changed to solve the root cause, reverting this change.

pkg/plugin/implementation/schemav2validator/extended_schema.go

@@ -383,22 +383,12 @@ func (c *schemaCache) validateReferencedObject(
 		return fmt.Errorf("at %s: %w", obj.Path, err)
 	}
 
-	// Strip @context and @type only if the schema does not declare them as properties.
+	// Strip JSON-LD metadata before validation
-	// Some schemas explicitly require these fields; stripping them in that case
+	domainData := make(map[string]interface{}, len(obj.Data)-2)
-	// would cause a "missing required field" validation error.
-	schemaProps := schema.Value.Properties
-	_, contextInSchema := schemaProps["@context"]
-	_, typeInSchema := schemaProps["@type"]
-
-	domainData := make(map[string]interface{}, len(obj.Data))
 	for k, v := range obj.Data {
-		if k == "@context" && !contextInSchema {
+		if k != "@context" && k != "@type" {
-			continue
+			domainData[k] = v
 		}
-		if k == "@type" && !typeInSchema {
-			continue
-		}
-		domainData[k] = v
 	}
 
 	// Validate domain-specific data against schema