Within a minute of Team Blocker’s arrival on Steiner between Haight and Waller, a mammoth tour bus rolls south down Steiner. Hunh? Clearly, it’s coming from Alamo Square up the hill a few blocks...but where it’s headed, we’re unsure. Duboce Park for a game or two of slobberball? Perhaps a little exercise up and down the Sanchez steps? Seems an odd route for a tour coach, seeing as how the Lower Haight has always been one of San Francisco’s most locally geared neighborhoods — as homegrown as its natty sibling, the Upper Haight, sometimes isn’t....