pub fn print_support_boundary_error(subcommand: &str, err: &dyn Display)Expand description
Print a support-boundary preflight error to stderr.
Used by every CLI entry point that runs check_postgres_version.
The “support boundary” prefix distinguishes infrastructure refusals
(wrong PG version, missing extension) from policy refusals (localhost
gate, production profile) and runtime failures (SQL error, network).