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Replace 16 interactive UI setup commands with pre-written profrc file containing [ui] and [notifications] sections (~1800ms saved per test). Replace sleep(1) + blocking waitpid with close(pty fd) → SIGHUP → polling waitpid(WNOHANG) → SIGTERM/SIGKILL fallback chain (~4900ms saved per test). Remove post-stbbr_start() and post-stbbr_stop() sleeps — bind+listen completes synchronously before stbbr_start() returns, and pthread_join() in stbbr_stop() guarantees socket cleanup (~200ms saved). Add PORTS_PER_GROUP=50 isolated port ranges per test group to enable safe parallel execution of 4 groups without port conflicts.