Method setDefaultCodeGraph

src/mcp/tools.ts:866–868

* Update the default CodeGraph instance (e.g. after lazy initialization)

(cg: CodeGraph)

   * Update the default CodeGraph instance (e.g. after lazy initialization)
   */
  setDefaultCodeGraph(cg: CodeGraph): void {
    this.cg = cg;
  }

  /**
   * Engine-only: register the catch-up sync promise so the next `execute()`