Michael Schneider Variety Editor at LargeSPOILER ALERT: Do not read if you haven’t watched the series finale of “Better Call Saul,” Season 6 Episode 13, “Saul Gone.”In the end, Jimmy McGill unbroke bad. Just when it looked like Saul Goodman (Bob Odenkirk) had finessed his way into a sweet plea agreement — just seven years at the most country club-like of correctional facilities (low-security FCI Butner Low, which even has a golfing program!) — he reversed course and confessed all, in Monday night’s series finale of AMC’s “Better Call Saul.”It was a finale rife with references to regret, time machines and how there’s “no shame in going back and changing your path,” as Chuck McGill (played by Michael McKean, who returns in a flashback) tells his younger brother.