Introduced the `ECMJobRunner.Domain` project to support both
.NET Framework 4.8 and .NET 8.0. Added `Profile`,
`ProfileSqlJob`, and `ProfileHistory` entities to map to the
database schema, including relationships and audit fields.
Updated `ECMJobRunner.Domain.csproj` to enable multi-targeting
and added dependencies for Entity Framework 6.5.1 and EF Core
8.0.11. Enabled nullable reference types and set the language
version to `latest`.
Added comprehensive documentation in `AGENTS.md` detailing the
project structure, entities, database schema, and build
instructions.
A new project, `ECMJobRunner.Domain`, has been added to the solution file (`ECM.JobRunner.sln`). The project targets both .NET Framework 4.8 (`net480`) and .NET 8.0 (`net8.0`) and includes metadata for NuGet packaging, such as `PackageId`, `Authors`, and `RepositoryUrl`.
Build configurations for `Debug|Any CPU` and `Release|Any CPU` have been added to the solution configuration. The project file (`ECMJobRunner.Domain.csproj`) also specifies the generation of XML documentation files.
