Add persistent OLED UI settings and recovery

docs/wiring.md

@@ -127,13 +127,13 @@ GPIO13 ───── select/confirm button ──── GND
 GPIO14 ───── next button ────────────── GND
 ```
 
-> **OLED voltage warning:** Power OLED `VCC` from `3V3`, not 5 V. Many OLED modules connect their SDA/SCL pull-up resistors directly to `VCC`; powering such a module from 5 V could expose the ESP32-S3 GPIOs to unsafe I²C levels.
+> **OLED voltage warning:** Power OLED `VCC` from `3V3`, not 5 V. Many OLED modules connect their SDA/SCL pull-up resistors directly to `VCC`; powering such a module from 5 V could expose the ESP32-S3 GPIOs to unsafe I²C levels. Power down before attaching or removing loose OLED wiring. Only perform live-removal fault tests with a connector designed to avoid shorts and unintended pin sequencing.
 
 Before applying power, verify whether the module already includes SDA and SCL pull-ups and where they terminate. Any module-mounted or external I²C pull-ups must go to 3.3 V. If pull-ups are absent, add suitable external pull-ups from SDA and SCL to `3V3`; if they are present, account for their parallel resistance before adding more. The buttons normally need no external pull-ups because firmware enables the ESP32 internal pull-ups.
 
 ## Electrical verification
 
-See [Electrical tests](electrical_tests.md) for Phase 7A OLED/button bring-up, safe loopback wiring, polarity checks, UART flow-control verification, and session-broker loopback testing.
+See [Electrical tests](electrical_tests.md) for Phase 7 OLED/button bring-up, persistent aging settings, optional-display and stuck-button fault recovery, safe loopback wiring, polarity checks, UART flow-control verification, and session-broker/concurrent-transport testing.
 
 ## Future hardware profiles