Add a production-ready Service Activator pattern slice.
Required scope:
- Fluent runtime API in PatternKit.Core for invoking application services from incoming messages.
- Source-generated factory path and generator attributes.
- TinyBDD runtime, generator, attribute, example, and catalog coverage.
- Real-world IServiceCollection example that can be imported through AddPatternKitExamples().
- Runtime, generator, example, and user-guide docs.
- Hosted CI, docs, and CodeQL green before merge.
Add a production-ready Service Activator pattern slice.
Required scope: