feat(pjrt): add program execution to LoadedExecutable#70
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feat(pjrt): add program execution to LoadedExecutable#70
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…fecycle) T60.2.1: BufferFromHost wraps PJRT_Client_BufferFromHostBuffer with Go type to PJRT element type mapping (F32, F64, F16, BF16, F8E4M3, S32, S64, etc.), shape validation, and buffer donation support. T60.2.2: ToHost/ToHostSlice wraps PJRT_Buffer_ToHostBuffer with async readback and PJRT_Event_Await synchronization. T60.2.3: Buffer metadata (Dtype, Shape, OnDeviceSizeInBytes, ReadyEvent) and lifecycle (Close, Delete) with double-close no-op for finalizer safety.
Add ccall, dlopenPath, and dlsym forwarding functions in pjrt.go so that buffer.go, client.go, and device.go do not import internal/cuda directly. Only pjrt.go holds the cuda dependency.
Implement LoadedExecutable.Execute(inputs []*Buffer, opts ...ExecOption) which wraps PJRT_LoadedExecutable_Execute. Builds input/output buffer handle arrays, calls the C API for single-device execution, synchronizes via PJRT_Event_Await, and wraps output handles in Buffer structs. Execution options support device ordinal selection and per-input buffer donation hints via the ExecOption functional pattern. Also migrates remaining cuda.Ccall references to the centralized ccall wrapper in pjrt.go.
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Phase 3 PJRT pipeline: execution support.