v4.0.0 — Open Cook (renamed, thermometer-agnostic)

Renamed from ChefsTemp Cook to Open Cook — a standalone, device-agnostic cook-timeline app that works with any HA temperature entities (ChefsTemp, ThermoPro, Govee, …). BREAKING: new domain open_cook does not upgrade in place — remove the old ChefsTemp Cook integration and its HACS custom-repo entry, then add https://github.com/ChuckBuilds/open-cook fresh (category: Integration) and reconfigure your probes. The ChefsTemp ESP reader (chefstemp-s1-ha) is unaffected.