blueprint_walkforward_family's pre-flight executed the full first-IS-
window sweep via blueprint_sweep_over and discarded the result, purely
to surface axis errors once before the parallel window fan-out (#177).
validate_axis_grid now drives the sweep terminal's own resolve/arity/
kind checks with a constant placeholder report — same single-sourced
rejection wording, no member run, no roller derivation needed.
Scope correction against the issue text: this path serves only the
synthetic (non---real) walkforward. The --real trunk routes through
verb_sugar into aura-campaign's [Sweep, WalkForward] process, whose
leading full-window sweep is a separate, larger duplication — re-filed
with corrected attribution in the issue's closing comment.
closes#253
claude
479c6620e2