Resolved! I'm disappointed to see that "Appendix A: Electrical schematics" has been removed from UM2179 User manual STM32 Nucleo-144 boards (MB1312) Are they available somewhere else?
I'm using the Nucleo-32 on another project and have found the schematics in UM1956 helpful in certain debugging scenarios, as well as a kind of reference design to help me get started on my own board design.