Very cool idea, though I think we're a long way away from this. Hopefully they file bugs on the specs when they find ambiguities.

Also the specs are written to define observable behavior, and there's a fair bit of ambiguity that's UA defined, but to be actually compatible with the Web requires doing what Chrome does.

The good news is that you can look at the source of the 3 major engines (and Ladybird!) and your AI agent can do comparisons to figure out optimizations.