Install or update Tessl Code Review in a GitHub repository by writing a thin caller workflow that invokes the Tessl Code Review Action. Inspects existing workflows and any Code Review caller already present, asks when reviews should run and whether findings should block the merge, proposes the change, and only writes after explicit approval. Use when someone wants to add, set up, enable, configure, update, or remove Tessl Code Review, AI code review, or automated pull-request review in a repository, or wants to switch it between advisory and gate mode.