Remove the self-grantable FUSION_RELEASE_AUTHORIZED env signal and replace
it with an interactive prompt: a real release now requires a live human to
type "authorized" at a TTY. Releases can no longer run non-interactively
(no TTY is blocked outright), and --yes does not bypass the typed phrase.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>