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I asked a question at the end of the last ACT talk, and John Baez kindly googled it for me (teaching me that I should google before asking in a seminar...) but the google search turned up a quite interesting paper that I thought someone in this community might wish to peruse: https://hal.archives-ouvertes.fr/hal-01429645/document.
Right: "Stochastic mechanics of graph rewriting" by Nicolas Behr, Vincent Danos, and Ilias Garnier! That's the most interesting paper I've seen about this stuff.