PCB needed Revisions

debug documentation should should show all TP pads, and not be the mirror image.

FET

populate coin charger as default with 6.3V target voltage (R=1.21meg)
way to measure coin cell voltage without charger enabled? MTR ENABLED -> disable 6V LDO
change D13 to diode that actually has 200mV drop @ 1uA. BAS116-F-7 appears to have 427mV @ 0.3uA

populate so local vbat is default (R222, R233 installed)
locate IMU header for easy access. possibly rot180 - or move 2mm away from edge.
remove 1.25mm headers for EC30, replace with single 12x0.8mm header. add 3.3V to 5V level shift output.
need to determine the accuracy of the RTC. Seems to be drifting.