Typically, we’d avoid posting about spoilers for a Marvel project (or any high-profile film or TV series) for at least a week. However, with “WandaVision” dropping Marvel bombshells every seven days, we can’t really sit back and ignore something awesome before the latest hot thing comes along Friday, can we? And with that, we want to talk about how great Kathryn Hahn has been on “WandaVision” and why she probably has the best theme song yet.