The new archive-gated e2e pins the #213 contract: a multi-symbol
generalize without --from/--to must resolve the shared campaign window
as the intersection (latest start, earliest end) of the listed symbols'
full archive windows. On the current tree it resolves symbols[0]'s full
window (AAPL.US listed first keeps AAPL's wider span on both bounds), so
the test fails RED. Expected windows are derived from the live archive
via single-symbol sweep probes, never hard-coded.
refs #213
Brummel
bb8c01895b