Project monthly contribution returns

Proxies advisor_functions mcp-multiple-payouts-installments-simulation-with-range. Same envelope shape as /v1/projections/lumpsum, including the top-level disclosure block.

Payout methodology — Savvly vs market alone: the payout values are calculated by comparing two investors of the same age committing the same principal. Investor 1 invests in the market with the Savvly Longevity Benefit; Investor 2 invests in the market alone (no longevity overlay). To make the comparison apples-to-apples, at each milestone age (80, 85, 90, 95) Investor 2 withdraws from their market alone portfolio the same dollar amount Investor 1 receives as a payout from Savvly. The payout_market_alone_* and total_market_alone_* figures are therefore what Investor 2 can actually withdraw to match Savvly's payouts before running out — they fall to 0 once the market alone portfolio is depleted. The savvly_upside_* (and total_savvly_upside_*) fields quantify how much more total money Investor 1 receives in payouts from Savvly than Investor 2 is able to withdraw over time to match those payouts.

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