[WIP] Enhance MCTS hybrid search functionality

[Copilot]

Thanks for the feedback on #8. I've created this new PR, which merges into #8, to address your comment. I will work on the changes and keep this PR's description up to date as I make progress.

Original PR: #8
Triggering comment (#8 (comment)):

@copilot The base branch hybrid-and-mcts-fix has a linking error that prevents successful builds:

undefined reference to `MetalFish::GPU::GPUTuningParams::select_strategy(int) const'
This is an LTO (Link-Time Optimization) issue where a function in gpu_nnue_integration.cpp is being optimized away during linking. I verified this exists in the base branch independently. The Lc0 NN work is complete and properly integrated, but the underlying build issue in the base branch needs to be fixed before the full test suite can run.

The merge conflicts are fully resolved and the code is ready for the base branch build issue to be addressed.

do we have this issue?

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