viable/strict/1791892488: [MTIA][Inductor] Add FIE C++ wrapper scaffold (#200206)
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What happened
Summary: Add an MTIA Full Inductor Eager C++ wrapper codegen scaffold with eager-only backend registration, ABI-correct tensor/scalar launch slots, and an explicit fail-fast native launch seam. Unsupported launch forms remain codegen errors until the native MTIA adapter is implemented. current selection chain: register_mtia_backend() -> register_backend_for_device("mtia", cpp_wrapper=MTIACppWrapperCodeGen) -> GraphL…
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