Every one of these exists because we needed it ourselves or got asked the same question enough times to write it down. None of them gate the result behind an email — you get the answer, and if you want a human to look at it, that is your choice rather than the price of entry.
They are ordered below by where you are in the project, because using the production diagnostic before you have built anything is as useless as using the readiness checklist after you have already shipped.