A curl|bash installer runs in a subshell, so the old "add this to your PATH"
warning left every fresh workstation one manual step short of a working cast —
hit for real standing up the coolify box (prod-migration Task 6 step 0).
The installer now appends the export to whichever profile $SHELL actually
reads (.zshrc / .bashrc / .bash_profile on macOS / config.fish), once, marked
"# added by cast-install". Already-on-PATH is a no-op; CAST_NO_MODIFY_PATH=1
opts out and restores the old warn-only behaviour.
Also: the "age not found" warning now names the install command per platform —
age is required before any apply, and the bare warning read as ignorable.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
