What living language is the most protocolized? As in most completely described by its rules, with the fewest unsystematic exceptions?

I’m guessing French

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I think such a language should be sought either among artificial languages (like Esperanto) or among those that underwent serious reforms in the 20th century when linguistics was already developed enough to systematize language well (like Russian, Turkish or Chinese). Also, I'd point out Finnish and Icelandic - there are historically really few exceptions in them.

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I agree, a növölang like Esperanto will have the most regular rules due to the bottom up, intentional design, and the fewest exceptions due to not having had centuries of corruption from everyday use