- ./check stress spins a fresh cube-server+cubec built from this tree on a
throwaway socket/store and drives ~150s of real prog/run traffic while
sampling the per-command latency + per-C telemetry.
- tools/stress.sh: never touches the production daemon; STRESS_SECONDS override.
- Fixed latent control-flow bug: the old '|| exit 0' guards made 'bench' and
'mount' subcommands unreachable after the gate (they exited early). Now uses
explicit run_* flags and only exits at the true end.
