Add host dispatcher#4041

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wsttiger wants to merge 8 commits intoNVIDIA:features/cudaq.realtimefrom

wsttiger:cudaq_realtime_host_dispatcher_sandbox

Commits on Feb 24, 2026

realtime: add host-dispatcher backend and integrate with cudaq_realtime API
wsttiger
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realtime: restrict host dispatcher to GRAPH_LAUNCH only
wsttiger
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Commits on Feb 25, 2026

realtime: add host dispatcher tests and external mailbox support
wsttiger
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realtime: add host C API ringbuffer helpers and expand dispatcher unit tests
wsttiger
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Commits on Mar 4, 2026

Updated host dispatch code with helpers
wsttiger
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Commits on Mar 6, 2026

Merged from main - updated the host dispatcher to present a C-API
wsttiger
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Commits on Mar 7, 2026

Replaced the volatile read with proper atomics load
wsttiger
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Commits on Mar 9, 2026

Updated RPC message payload - added request id and timestamp
wsttiger
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