OptionalmodeSolve strategy. Default: 'auto' (rpc if client provided, else wasm if
@btx-tools/matmul-wasm is installed, else pure-js).
OptionalpureForwarded to the pure-JS solver. Ignored for other modes.
OptionalrpcRequired for mode === 'rpc'. Ignored otherwise.
OptionalwasmForwarded to the WASM solver. Ignored for other modes.
Options for Solver.solve.