fix: remove malformed Google Classroom OAuth scope
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Removes the malformed classroom.course-work.readonly OAuth scope. Google Classroom documents classroom.coursework... scope names without the extra hyphen, and the config already requests broader valid coursework scopes.\n\nValidation:\n- Checked against Google Classroom OAuth scope docs.\n- Provider URL smoke test reached Google sign-in; validation appears post-login, so this fix is doc-based.