The clap help promises "persists each member's taps" and the chart hint
recommends `aura sweep --trace`, but every blueprint-mode arm discards the flag
(run_blueprint_sweep's `let _ = persist`, the --real sugar's persist_taps: vec![])
— the surface advertises trace-recording the code drops. Pin the decided honest
behaviour: sweep/walkforward refuse --trace up front (exit 2, naming the flag and
pointing forward to the deferred trace feature #224), mirroring the aura run / mc
refusals.
refs #168
Brummel
53bbcedeec