Provide contextual error messages

// Poor: Generic error message
throw new Error("act() is not implemented on the base page object");

// Better: Contextual error with actionable guidance
throw new Error(
  "act() is not implemented on the base page object. Ensure you are calling init() on the Stagehand object before calling methods on the page object."
);

// Best: Include original error details when wrapping
constructor(error?: unknown) {
  if (error instanceof Error || error instanceof StagehandError) {
    super(
      `\nHey! We're sorry you ran into an error. \nIf you need help, please open a Github issue or reach out to us on Slack: https://stagehand.dev/slack\n\nFull error:\n${error.message}`
    );
  }
}