Add PCB, production files, and initial documentation - unzahl - Integrated STM32G431 Le Chiffre Keyboard PCB

commit 6e831526a0fdb3fa442e8445b1757abf27d9e4a3
Author: Jack Sangdahl <jack@pngu.org>
Date:   Sat, 25 Oct 2025 10:41:21 -0600

Add PCB, production files, and initial documentation

Diff is too large, output suppressed.

	unzahl Integrated STM32G431 Le Chiffre Keyboard PCB
	git clone https://git.pngu.org/unzahl
	Log \| Files \| Refs \| README \| LICENSE