evolution writes shitty spaghetti code that's highly vulnerable to minor changes in the runtime environment during the build process, and has no error-checking or error-correcting short of a crash.

Precisely, it also has no reason to neatly compartment mental from physical.

Since the brain structure develops at a totally different stage from the secondary sexual characteristics (continuously from birth through childhood vs. puberty)

However, most aspects of brain structure do in fact develop either pre-birth or during puberty, same as the other secondary sexual characteristics, and the primary sexual characteristics for that matter.

Citation needed; evolution writes shitty spaghetti code that's highly vulnerable to minor changes in the runtime environment during the build process, and has no error-checking or error-correcting short of a crash.

What do you mean with that statement? There are various DNA repair mechanisms that do error checking.

Evolution frequently copies genes and then changes one of those copies. You could see that as a way to produce redundancy against errors.

We have two copies of every chromosome to provide for some error correction and survive one of the two being broken.