v4.0.0

4.0.0 (2026-07-22)

⚠ BREAKING CHANGES

• datamodel: DataModel now owns IEntity/IEntity. Consumers must
  upgrade eQuantic.Core.Data and eQuantic.Core.DataModel together — mixing this
  DataModel with eQuantic.Core.Data <= 5.8 (which still defines IEntity) yields a
  duplicate/ambiguous type (CS0433/CS0311). eQuantic.Core.Data 5.9 drops the
  definition and forwards the type. The Api.Sample references core-data 5.8
  directly and will bump to 5.9 as part of the coordinated upgrade.

Features

• datamodel: own the IEntity contract and drop the dependency on eQuantic.Core.Data (0edb843)