Changes to Create a Reason

added the pattern ^[^\u0000]*$ to the request property name

added the required property audience to the response with the 201 status

added the required property default_model to the response with the 201 status

added the required property default_reasoning_effort to the response with the 201 status

added the required property default_repositories to the response with the 201 status

added the new optional request property instructions

added the required property instructions to the response with the 201 status

endpoint added