feat(synapse-core): add target runway deposit helper - #906
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This was referenced Aug 4, 2026
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What changed
Adds
calculateTargetRunwayDeposit()to@filoz/synapse-core/pay.The pure helper calculates the additional token amount needed to clear current debt and provide a requested runway:
It uses
bigintbase units and leaves any buffer explicit in the requested runway.Why
Clients that display a suggested account top-up can use the same calculation without duplicating payment-account arithmetic.
Scope
This does not add network requests, contract writes, date formatting, funding-status categories, or routing behavior.
Validation
pnpm --filter @filoz/synapse-core run lint:fixpnpm --filter @filoz/synapse-core run buildpnpm --filter @filoz/synapse-core run test