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zeekay
9df775cca2
orderuser->full 16-byte user is the only settlement identity; 8-byte UserID is a matcher/STP handle only, never a money key. Missing orderuser fails closed (ErrMissingSettlementUser), no matcher-handle fallback. Ownership invariant harness alongside conservation (catches value-conserving theft). txHash-ref custody idempotency closes vault-drain/strand. Reject zero-lock orders; persist orderuser before book insert; restart asserts coverage.