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Firstly I should say if anyone professional or even competent starts asking too many questions, the illusion that I know what I'm doing is going to dissolve VERY quickly
Secondly, in this instance the roof is very light, and the pitch is sufficient that it sheds any weighty debris aka wet leaves, snow etc
I expect you're right that I've over-engineered the ridge board such that is could act as a ridge BEAM. The posts are still in place as part of the stud framing in the gable ends, but more to give bracing to the cladding than to support the ridge
This is a very cool project!
One question with my structural engineer's hat on though:
What is stopping roof spread and the walls being pushed outwards when it snows? If the rafters don't have a vertical support at the top, they will have a horizontal reaction at their base. In a traditional timber residential roof with a ridge board, this thrust is taken out by the loft joists acting as ties but I don't see any. TBH, your ridge board looks big enough to be working as a beam, is it still sitting on posts?