* fix(worktrees): honor saved setup configuration
Project Settings writes paseo.json in the source checkout, but existing committed copies in new worktrees previously won silently. Copy the saved project config before lifecycle setup so the command shown to users is the command that runs.
* fix(worktrees): replace config symlinks safely
A selected ref can place a symlink at paseo.json, so copying over that path may overwrite a file outside the worktree. Materialize the saved source config with atomic rename semantics to replace the path entry without following it.
