Traceability & Records
======================

	* For each unit:
		* SN
		* PCB lot/date code
		* Component lots (critical ICs)
		* Build date
		* Line/oven/profile ID
		* Operator
		* Inspection/programming/test logs
	* Retention: at least (define period, e.g., 10 years) or per customer/standard
	* Change control via ECN/ECO with version updates on layout/FW/test equipment