* Filter empty AIContent from durable agent state responses
Prevent opaque AIContent objects (e.g., with only RawRepresentation set)
from being stored in durable entity state, where they serialize to empty
JSON payloads. Base AIContent instances are kept only if they have
Annotations or AdditionalProperties.
Fixes https://github.com/microsoft/agent-framework/issues/4481
* Update CHANGELOG.md and fix linter violation
* Propagate orchestration ID (if any).
* Add integration test for orchestration ID in entity state.
* Update schema.
* Fixup formatting issues.
* Fix more formatting issues.
* Upgrade to .NET 10
- Require .NET 10 SDK
- Include net10.0 assets in all assemblies
- Move net9.0-only targets to net10.0
- Update LangVersion to latest
- Remove complicated distinctions between debug target TFMs and release target TFMs
- Remove unnecessary package dependencies when built into netcoreapp
- Clean up some ifdefs
- Clean up some analyzer warnings
* Fix CI