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In our swift-syntax wrapper, we now attempt to fold all operator sequences (i.e. `sequenceExpr` nodes) into appropriate `infixOperatorExpr` nodes, assuming the requisite operator definitions are present. Currently, we only consider operators that are defined in the standard library, and operators that are defined in the current file, leaving operators defined in separate modules as future work. The folding is done maximally -- if an argument of an unknown operator can be folded in isolation, then this is done. Each top-level sequence is folded independently, so a single unknown operator leaves only its own sequence flat rather than aborting folding elsewhere.