Fix Windows MSVC tournament build

[DMDTague]

Fixes the Windows native build failures reported by the local Elo harness.

Changes:

• portable MSVC implementations for bitboard popcount / least-significant-bit helpers
• removes the remaining direct GCC-only ctz builtin from magic initialization
• uses /O2 under MSVC instead of the GCC/Clang -O3 flag
• ensures the standard tm type is established before Pickle's legacy global time-manager symbol on MSVC
• adds a real windows-latest native CMake/MSVC build and UCI smoke test to tournament CI

This is portability work only; search/evaluation behavior is unchanged.

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Project	Deployment	Actions	Updated
pickle	Ready	Preview	Sep 17, 2026 1:16am UTC

[coderabbitai]

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