* removed display_name, renamed context_providers, middleware and AggregateContextProvider
* fixes
* fixed test
* testfix
* removed mistakenly put back test
* updated new test
* rename middlewares to middleware
* middleware fixes
* Add Handoff orchestration pattern support
* PR feedback
* Use AOAI client in samples
* Adjust to tool
* Handoff to sub-agent via ai function
* PR feedback
* More cleanup
* Improvements
* PR feedback cleanup
* Add handoff migration sample.
* Remove type ignore
* fix markdown link formatting
* Remove readme link for non-existent sample