Distributed Object Abstraction in HPX

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" summary

An HPX library layer implements a single logical object partitioned across localities with per-locality server/client components registered as HPX components; remote access uses an explicit fetch(locality_index) that returns futures. The demo builds a distributed int array across N nodes, issues remote fetches using ranges and HPX execution policies, and performs a distributed reduce (add) back on locality 0. Implementation is UPC++-inspired, uses HPX actions and futures, and runs end-to-end.

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