aggregateGroupMetrics

Compute the pure, price-independent QuoteGroupMetrics for a set of child quotes. Called for you by groupQuotes; exported so a consumer can re-aggregate an arbitrary subset (for example, only the legs a user selected).

• openQuantity / quantity are plain sums.
• initialNotional = Σ(quantity × (initialOpenedPrice ?? requestedOpenPrice)) — the frozen at-open notional; partial closes do not shrink it.
• weightedOpenPrice = Σ(openQuantity × openPrice) / Σ openQuantity, suppressed when there is no open size or any child has an unsettled open price.
• leverage divides the at-open notional by Σ of every locked leg, each child preferring its frozen initialLockedValues.

Pure and order-independent. Empty input yields all-zero amounts with the optional fields undefined.

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