Change `mergeEffective` delegate in `ResolveWinners<T>` from `Func<string?, T, string?>`
to `Func<Winner<T>, T, string?>` so the alarm hook can inspect the existing winner's row.
Gate the per-setpoint merge in `ResolveAlarmWinners` on both sides being HiLo
(`existingWinner.Row.TriggerType == HiLo && derived.TriggerType == HiLo`), matching
`FlatteningService.ResolveInheritedAlarms` exactly. Base non-HiLo + derived HiLo now
falls through to whole-replace (derived config verbatim) — the same path the flattener
takes. Preview-only fix; the deploy path is unchanged.
Add test: `Resolve_BaseNonHiLo_DerivedHiLo_DerivedConfigWinsVerbatim` — asserts
resolver and flattener agree when base is ValueMatch and derived overrides to HiLo.
Joseph Doherty