v157 - OLD preferred layout at safe v43 speed

Controlled isolation from confirmed non-flashing v153:
- exact old v132 A coordinates
- exact old v132 B coordinates
- v43 shell/lifecycle retained
- v43 250 ms metro retained
- no old slot/note/state renderer

Why:
v154 at 250 ms did not flash.
v156 changed only 250 -> 120 ms and the flash returned in hardware.
So 120 ms is now the strongest isolated trigger.
This build checks the preferred old geometry independently at 250 ms.
