The checkout actions shared by the project home and a session — open on GitHub, in the file manager or the preferred editor (pickable and remembered right there), and serve a preview — addressing the project's tree from the home and the session's own worktree from a session, so a session is never the one page you cannot open.

## Before writing SPEC.md files

Read https://raw.githubusercontent.com/brillout/sdd/refs/heads/main/sdd.md
