It’s worth recalling a stand-alone movie was actually the original plan for this series, which features Ewan McGregor reprising his role from the prequel trilogy, before the box-office underperformance of “Solo” prompted Lucasfilm to go in a different direction. The answer comes in “Obi-Wan Kenobi,” a six-episode Disney+ series whose first two chapters stirringly deliver what fans should desire from a show as eagerly anticipated as any theatrical blockbuster. What was Obi-Wan Kenobi up to during those years when he was watching over Luke Skywalker after the Republic’s fall in “Revenge of the Sith?”