One iteration, three tasks: (1) extract blueprint_axis_probe and subsume the
two existing inline copies of the wrapped-namespace probe
(blueprint_sweep_family + blueprint_mc_family) into it — the single source the
spec's rationale requires; (2) the --list-axes surface (SweepBlueprintArgs
field, valueless-flag parse + standalone guard, list_blueprint_axes, dispatch
short-circuit); (3) four E2Es (open lists prefixed names, closed empty,
combined-flags reject, malformed-blueprint safety — no panic).
refs #169
Brummel
581c86b091