Entity IDs with mismatched domains are deprecated

Integrations that set entity_id directly on an entity will now be validated to ensure the domain portion matches the platform's domain. For example, a light entity must use light.my_light, not cover.my_light.

Setting an entity ID with the wrong domain will log a deprecation warning and will stop working in Home Assistant 2027.5.

In most cases, integrations should not set entity_id at all — Home Assistant will generate it automatically.