Scaffold and author a custom Tessl reviewer plugin, by forking the default rubric or building one from scratch. Fetches the published default Tessl review rubric (tessl/default-skill-review) so you can read and tweak it, scaffolds the plugin directory, writes rubric files and config.json, and validates with tessl review run. Use when the user wants to create or customise a review plugin, fork or tweak the default reviewer rubric, change scoring weights, add custom judges, or build a domain-specific rubric for tessl review.