Does plain-error review of a government's plea agreement breach focus on the scope of commitments to determine if the breach constitutes a 'plain' error under Federal Rule of Criminal Procedure 52(b)?

QUESTION PRESENTED FOR REVIEW The Court in Puckett v. United States, 556 U.S. 129, 137 (2009), recognizes that “plea bargains are essentially contracts:” 1. Does “plain-error review” of a defendant’s claim that the government breached a plea agreement focus on the “scope of the Government’s commitments” to determine whether those commitments are “clear or obvious” in establishing that an error resulting from the government’s breach of the agreement is “plain” under Fed. R. Crim. P. 52(b), as contemplated in Puckett, 556 US. at 143? i