Monitor Lucidia SD degradation (mmc0 busy errors)

**Node**: Lucidia (.38) | **Priority**: Medium | **Status**: In Progress

SD card showing "mmc0: Card stuck being busy!" in dmesg. Swap growing (1.3GB/8.5GB).

- Monitor with power-monitor.sh (cron */5)
- Plan SD card replacement or migration to USB/NVMe
- Reduce write pressure: minimize logging, swap usage