v0.3.5 - Learned Eletta frames survive restarts

Learned Eletta Explore (oem_model=DL-striker-cb) beverage frames now persist across Home Assistant restarts.

Since v0.3.4 the integration learns the exact bytes the official Coffee Link app sends for each beverage and replays them. Until now that learning lived only in memory, so every restart meant re-triggering each drink from the app.

It is now saved to disk (Home Assistant Store, debounced) and restored at setup - teach each drink once from the app and it is remembered for good.

The PrimaDonna Soul (DL-millcore) path is untouched. 33 unit tests pass.