Add process memory priority foundation

[PrimeBuild-pc]

Summary

• Adds a backend/testable process memory priority foundation using GetProcessInformation / SetProcessInformation with ProcessMemoryPriority and MEMORY_PRIORITY_INFORMATION.
• Adds the documented ThreadPilot memory priority model levels: VeryLow, Low, Medium, BelowNormal, and Normal.
• Extends persistent process rules with optional memory priority application and result reporting.
• Registers fakeable native/service abstractions in DI.

Notes

Memory priority is not CPU priority. CPU priority influences CPU scheduling. Memory priority is a hint to Windows about how aggressively process memory can be reclaimed or paged under memory pressure.

Safety and limits

• No preset generator changes.
• No CPU topology migration changes.
• No affinity apply path redesign.
• No Windows Service implementation.
• No registry/IFEO persistence.
• No UI redesign.
• No version bump or tag.
• No anti-cheat or protected process bypass claim.

Tests

• dotnet test "ThreadPilot_1.sln" --configuration Release --no-restore
• Result: 282 passed, 0 failed, 0 skipped.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 67.40088% with 74 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
Services/ProcessMemoryPriorityService.cs	62.75%	44 Missing and 10 partials ⚠️
...atforms/Windows/IProcessMemoryPriorityNativeApi.cs	0.00%	16 Missing ⚠️
Services/PersistentRulesEngine.cs	94.73%	0 Missing and 2 partials ⚠️
Services/ServiceConfiguration.cs	0.00%	2 Missing ⚠️

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