WASHINGTON — Aides have President Joe Biden take the shorter stairs to board Air Force One. When it comes to news conferences, they yell loudly — and quickly — to end the questions, sometimes stealing a classic awards show tactic and playing loud music to signal the conclusion of the event. And forget about regular interviews with major news publications, including a traditional presidential sit-down on Super Bowl Sunday.Over the years, some of Biden’s key aides have gone from letting “Joe be Joe” to wrapping a presidential cocoon around him that is intended to shield him from verbal slips and...