plan: 0107 campaign executor
10 tasks, strictly sequential: walk_forward vocabulary correction (research + cli twins, workspace-green per task), engine ListSpace, registry campaign-run store + visibility promotions, aura-campaign crate (scaffold/types, preflight, execute sweep+gate, walk-forward stage via byte-exact stub replacement), CLI verb + MemberRunner driver, seam tests + gated real-data e2e, #196 on-ramp verbs. Drafted per-task against the live tree, seam-reconciled (task 6/7 signature + module home unified; scaffold dead-code allowances dropped by the task that consumes them), self-reviewed per the planner checklist (no placeholders, single-filter test gates, compile-gate ordering honoured via partial -p gates in task 1). refs #198, refs #196
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