A stylized nonmedical mass-and-energy thought experiment, not a biological healing model, prediction or guidance. Patch mass 100 g. Chosen dry building-material feed maps one-to-one to replacement mass, chosen energy cost 10 kJ/g and 70% of input becomes heat; the rest is assigned stored chemical energy in new material. All numerical repair costs, rates and control are explicitly invented, not measured Wolverine or human biology. Each run is capped at the 100 g patch; animation compresses its reported duration into 3 s. No claim is made about how tissue organizes or how real injury heals.