I'm actually collecting playbooks and here's my list (apart from hanno):
As for hanno, I loved their case studies, which are now removed since they focused on healthcare. But they also got this: https://github.com/wearehanno/designthinking/wiki
I recently had a client referenced playbook.cio.gov. For some reason it got me thinking and I went down a rabbit hole and found this site.
I like of like the idea to onboard new designers, unity processes, or just educate sales/clients on this mythical buzzword "UX".