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TDD stands for test driven development. It makes developers think before starting to code. This leads to better organized code. It requires the developer to write the code for the test first, this means that it's based on automated tests. There are no testers in scrum, they are called developers as well.

If you are not sure, review the daily scrum section in the scrum guide.

A ready product item needs to be able to be done in a sprint (scrum guide). In order for it to be ready, the product owner and the developers need to understand it well. Tracking tools and requirements analysis and how user stories should be made isn't part of scrum or the best practices for development.

The scrum guide says: "A new Sprint starts immediately after the conclusion of the previous Sprint."

Refactoring is only about the own code, so not about changing an external interface or api.

The scrum guide says: "The Scrum Team may also invite other people to attend Sprint Planning to provide advice."

The sprint is the heartbeat of scrum, during the sprint the increment is created. The increment must be usable and all the work that's part of the increment should adhere to the definition of done.

If you are not sure, please review the section scrum artifacts in the scrum guide.

Review the scrum guide section sprint planning if this is still an uncertainty for you.

The product owner knows what creates most value. Since this is already delivered, it is not part of the current sprint.