I believe that there are four steps in this process:

• 1. Copy the code from the old repository to the new repository.
• 2. Fix the build system to build from the new location rather than the old.
• 3. Move the issues from the old repository to the new repository.
• 4. Update dartlang docs to point to new README location.
• 5. Remove the old repository. Make the old repo read-only. (Follow-up: Make deprecated analyzer_cli repo "read-only". #25192.)

We should wait to start this until 1.13 has shipped. When a step is finished, please mark it and assign this issue to the person responsible for the next step (or me if you don't know who that is).