setup.md

Run tesserae_setup_plan for the current working directory. Show the rendered_summary to the user verbatim. Then ask:

1. Should I install the flagged dependencies? (sets confirm_install_actions)
2. Should I run the post-setup refresh commands? (sets confirm_run_actions)

Call tesserae_setup_apply with the appropriate flags. Report actions_taken and warnings. If drift is non-empty, surface it before applying.