bench: refresh baseline and fix Windows wheel device link

[KemengHuang]

Summary

• establish the four-scene canonical performance benchmark suite and archive the RTX 5090/CUDA 13.2 baseline
• synchronize user and agent documentation with current solver, serialization, and benchmark behavior
• restore the final CUDA RDC device-link for CMake Visual Studio generators used by Windows wheels
• retain the existing CUDA domain OBJECT targets and XMake final-target ownership

Validation

• repository contracts: 36/36
• full MkDocs + Doxygen/API build
• Ninja CUDA backend/device-link build and focused 0_abd_gravity IPC/AL test: 178 assertions
• full Visual Studio 2022 CUDA backend build: all 198 functional sources, nvcc -dlink, DLL load successful
• GitHub CMake, XMake, and Repository Contracts: passed
• manual cibuildwheel matrix: Windows/Linux CPython 3.10-3.14, 10/10 passed