Adds two small, additive fridge capabilities:
- AI_ENERGY_LEVEL: a select on /energy/ailevel/vs/0 exposing the AI
energy-saving level, gated behind supportedAiLevel actually offering
more than one choice (previously globally ignored since every dump
seen only reported a single supported level).
- selfcheck_error: a diagnostic sensor on the existing SELF_CHECK
capability surfacing x.com.samsung.da.error from the last self-check,
for hardware that reports it.
This does not touch FLEX_ZONE, /mode/vs/0, or /icemaker/status/0.
Tim Schindler
2a0a9f32ee