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Gonna give a novice opinion here, but based on the info you provided, my suspicion would tend to fall on the shop that recently did your rim repair. That is a pretty low profile tire and it is harder (I hear tell) to mount that setup. When they did your rim repair, they presumably had to un-mount and then re-mount the tire. That would have put extra stress on the sidewall. Many shops won't touch anything that low profile without making you sign something that says you understand that mounting them could destroy the tire / rim / etc.
The fact that it's a catastrophic tear not in the sidewall at the most weak points, but at the place whree it should be stronger, close to the bead-contact surface where the metal bands are and there is more rubber, I think my suspicions would be the same even if you didn't say you just had the rim serviced at your indie shop recently....
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