fix token consumption so we dont get random data at the end

dynamodb/expression.odin

@@ -203,6 +203,16 @@ parse_key_condition_expression :: proc(
 		sk_condition = skc
 	}
 
+	// Verify all tokens were consumed (no trailing garbage)
+	if trailing := tokenizer_next(&t); trailing != nil {
+		delete(pk_name)
+		attr_value_destroy(&pk_value)
+		if skc, has_skc := sk_condition.?; has_skc {
+			skc_copy := skc
+			sort_key_condition_destroy(&skc_copy)
+		}
+		return
+	}
 
 	kc = Key_Condition{
 		pk_name      = pk_name,