fix: readonly simulate extra opcode budget handling (#414)

* fix: readonly simulate extra opcode budget handling

The simulate for readonly calls now uses a fixed maximum opcode budget.
Updates tests to reflect the new behavior.

* chore: remove max fee enforcement for readonly calls

* fix: adjust test and clarify some docs

---------

Co-authored-by: Neil Campbell <neil.campbell@makerx.com.au>

Author: aorumbayev

.nsprc

@@ -1 +1,6 @@
-{}
+{
+  "1105444": {
+      "reason": "Vulnerability is in npm's bundled dependencies (brace-expansion) and cannot be fixed automatically. This is a low severity RegEx DoS vulnerability in npm's internal tools. npm team needs to update their bundled dependencies.",
+      "expiry": "2025-12-31"
+    }
+}