  Multimode entanglement is an essential resource for quantum information in
continuous-variable systems. Light-based quantum technologies will arguably not
be built upon table-top bulk setups, but will presumably rather resort to
integrated optics. Sequential bulk optics-like proposals based on cascaded
integrated interferometers are not scalable with the current state-of-the-art
low-loss materials used for continuous variables. We analyze the multimode
continuous-variable entanglement capabilities of a compact currently-available
integrated device without bulk-optics analog: the array of nonlinear
waveguides. We theoretically demonstrate that this simple and compact
structure, together with a reconfigurable input pump distribution and multimode
coherent detection of the output modes, is a versatile entanglement synthesizer
in the spatial domain. We exhibit this versatility through analytical and
numerically optimized multimode squeezing, entanglement, and cluster state
generation in different encodings. Our results re-establish spatial encoding as
a contender in the game of continuous-variable quantum information processing.
