Does a Plea Agreement which waives challenges to collateral relief forbid challenges to ineffective assistance in proceedings following the entry of the plea?

QUESTIONS PRESENTED 1. Does a Plea Agreement which waives challenges to collateral relief forbid challenges to ineffective assistance in proceedings following the entry of the plea? 2. Ought the Court exercise its supervisory power to clarify the above question in light of its effect on the Constitutional right of habeas corpus? 3. Whether ineffective assistance in violation of the Sixth Amendment may be challenged for attorney’s serious errors following entry o the Plea Agreement? 4. Does a claim that the waiver was unknowing validate a habeas claim after appeal is denied?