Without image removal, reinstalling reuses the old cached image even if
a newer one is available. Read TRITON_MANAGE_IMAGE from .env (falling back
to :latest) and rmi it after stopping containers.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
BASH_SOURCE[0] is unset when a script runs via `curl | bash` (no source
file on disk). With `set -u` this triggers "unbound variable" and exits.
Fall back to $0 with ${BASH_SOURCE[0]:-$0} so piped execution works.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>