CPU topology v2 phase 2: add topology provider abstraction

[PrimeBuild-pc]

Summary

• Adds ICpuTopologyProvider as a testable topology snapshot abstraction.
• Adds WindowsCpuTopologyProvider backed by GetSystemCpuSetInformation and GetLogicalProcessorInformationEx for CPU Set IDs, processor groups, group-relative logical processor numbers, global indexes, core indexes, efficiency classes, NUMA nodes, L3/cache groups, packages, and SMT sibling metadata.
• Extends CpuTopologySnapshot with optional topology metadata while preserving the legacy affinity-mask conversion model from phase 1.
• Adds fake-provider and simulated topology tests for single-group, multi-group, hybrid efficiency classes, SMT on/off, dual L3 groups, and >64 logical processors.

Validation

• dotnet test "ThreadPilot_1.sln" --configuration Release --no-restore passes: 173 passed, 0 failed.

Scope intentionally left unchanged

• No runtime affinity application changes.
• No ProcessService or ProcessCpuSetHandler behavior changes.
• No UI changes.
• No preset generator changes.
• No profile or legacy-mask persistence changes.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 30.91603% with 181 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
Services/WindowsCpuTopologyProvider.cs	0.00%	172 Missing ⚠️
Services/WindowsCpuTopologyNativeLayout.cs	81.08%	5 Missing and 2 partials ⚠️
Models/CpuSelection.cs	96.22%	2 Missing ⚠️

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