The third season of HBO’s award-winning black comedy “Succession” was supposed to premiere a year ago, but the pandemic halted production for many months. Series creator Jesse Armstrong says despite the delay, the cast was soon back in the zone when they finally reunited. Armstrong tells KCRW how the road to “Succession” began with a script about an imagined Murdoch family dinner, and explains why he re-writes his scripts — full of lacerating insults — throughout the production process.