The six Close-only open sites route through the resolved binding's
column set via open_columns (probe_window, open_real_source,
run_sources/windowed_sources, the campaign member open, the trace
re-run open) — a strategy declaring high/low/close roles gets exactly
those columns, merged in the canonical C4 order. Synthetic data refuses
any binding beyond {close} with the honest --real remedy (the walk
generates a close series only); the sweep/mc family builders ride their
established Err contract, run/walkforward/reproduce refuse exit-1.
Proof at two layers: an engine e2e composes an OHLC blueprint from data
and runs it over four inline VecSources to hand-computed rows (the
merge-order pin), and an archive-gated CLI e2e sweeps a high/low
blueprint over GER40 opening the High and Low columns.
Verified: engine OHLC e2e green, full workspace suite green, clippy -D
warnings clean.
refs #231
Brummel
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