CPU topology v2 phase 3: make CPU Sets mapping group-aware

[PrimeBuild-pc]

Summary

• Replaces the fragile LogicalProcessorIndex -> CpuSetId CPU Sets mapping with ProcessorRef -> CpuSetId, preserving group and group-relative logical processor number.
• Adds reverse CpuSetId -> ProcessorRef mapping for verification/logging-ready lookup.
• Adds ApplyCpuSelection(CpuSelection, bool) on IProcessCpuSetHandler/ProcessCpuSetHandler without wiring it into ProcessService yet.
• Keeps legacy ApplyCpuSetMask(long, bool) available and documents it as single-group <=64 logical processor compatibility path.
• Adds a fakeable native API seam so CPU Sets behavior is testable without admin rights or protected processes.

Tests

• Group 0 CPU0 and Group 1 CPU0 remain distinct in the CPU Set map.
• CPU64 resolves to its own CPU Set and does not alias CPU0.
• CpuSelection with explicit CPU Set IDs applies those IDs.
• CpuSelection without CPU Set IDs resolves via ProcessorRef -> CpuSetId.
• Missing CPU Set mapping fails without native apply.
• Clear selection calls SetProcessDefaultCpuSets(handle, null, 0).
• Legacy ApplyCpuSetMask(long) remains characterized for single-group <=64 and does not represent Group 1 CPU0.

Validation

• dotnet test "ThreadPilot_1.sln" --configuration Release --no-restore passes: 189 passed, 0 failed.

Scope intentionally left unchanged

• No ProcessService runtime wiring to CpuSelection.
• No UI changes.
• No preset generator changes.
• No profile/core-mask migration changes.
• No anti-cheat or protected-process bypass behavior.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 61.53846% with 55 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
Platforms/Windows/ProcessCpuSetHandler.cs	41.25%	34 Missing and 13 partials ⚠️
Platforms/Windows/IProcessCpuSetNativeApi.cs	0.00%	8 Missing ⚠️

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Retry CPU-set mapping after initialization failures

Marking static initialization as complete even in the exception path makes a transient GetSystemCpuSetInformation failure permanent for the process lifetime. After one failed probe, staticCpuSetMapping is frozen as Empty, so later handlers never retry and both legacy mask application and processor-resolved ApplyCpuSelection will keep failing until restart. This regresses resiliency versus the prior behavior that retried on subsequent handler creation.

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