Eval: Queen infiltration bonus for 4-player chess

[KnightStackSys]

Summary

• Reward queens that infiltrate the home-side territory of opposing kings on all four cross-board orientations.
• Scale by penetration depth and king proximity, while excluding queens still at home or directly attacked by the opposing team.
• Add tuneable EvalQueenInfiltration UCI spin option (default 2, 0 disables) without changing NNUE scoring.
• Add Release-safe smoke checks covering all four colors, unsafe queens, allied/home territory, and disabling the term.

Testing

• New tests/smoke.cpp checks are included in the existing CTest target and work in Release builds.
• Existing CI runs on pull requests targeting main; review its Linux GCC and Windows MSVC checks before merging.
• Elo/SPR Tuning: not run; retain draft status pending validation.