chore(core): add generic purchase_item economy primitive (ee2caa0 -> c8269d0)
Advance openfut-core gitlink to c8269d0, which adds services::economy::purchase_item (atomic debit + mint) — the generic Core primitive the FIFA17 synthetic-seller transfer market needs. Evidence: the Python economy audit proved market buy-now mints a new item with no real counterparty, so debit+mint (not two-party transfer) is the correct generic model. Core matrix + clippy green.
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