[WIP] Add initial structure for sparkplus library

[Copilot]

• Explore repository (empty, only LICENSE present)
• Create CMakeLists.txt — interface library + pybind11 extension + tests
• Create include/sparkplus/constants.hpp
• Create include/sparkplus/exceptions.hpp — inline constructors for Python linkability
• Create include/sparkplus/types.hpp — enums, Tensor, InputBatch, OutputBatch, callbacks
• Create include/sparkplus/device_info.hpp — CpuInfo, GpuInfo, DeviceInfo, DeviceProbe
• Create include/sparkplus/memory_manager.hpp — IMemoryPool, CpuMemoryPool, GpuMemoryPool, MemoryManager
• Create include/sparkplus/stream_manager.hpp — IStreamManager, CudaStreamManager
• Create include/sparkplus/input_feed.hpp — IInputFeed, IOutputFeed, InputFeed, OutputFeed
• Create include/sparkplus/session_manager.hpp — ISession, OnnxSession, SessionPool
• Create include/sparkplus/pipeline.hpp — IPipelineStage, IPipeline, Parallel/Cascade/HybridPipeline
• Create include/sparkplus/adr.hpp — IRunnable, IAdr, Adr, MultiModelAdr, factory functions
• Create include/sparkplus/sparkplus.hpp — umbrella header + SPARKPLUS_API macro
• Create python/bindings.cpp — pybind11 bindings (enums, structs, exceptions, abstract interfaces)
• Create python/sparkplus/__init__.py — Python package
• Create python/sparkplus/py.typed — PEP 561 marker
• Create pyproject.toml — scikit-build-core wheel config
• Create tests/test_interfaces.cpp — static_assert compile-only tests
• Create tests/test_python.py — Python import/enum/struct smoke tests
• Create .gitignore
• Verify headers compile (g++ -std=c++17)
• Run Python smoke tests

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