CPU topology v2 phase 6: migrate profiles and core masks to CpuSelection

[PrimeBuild-pc]

Summary

Adds a conservative CpuSelection migration and compatibility layer for persisted profiles and core masks.

• Adds schema constants where legacy files without a schema version are treated as version 1 and CpuSelection-backed files are version 2.
• Adds CpuSelectionMigrationMetadata for affinity/core-mask migration provenance, confidence, topology signature, review state, and source legacy mask.
• Adds a public ProcessProfileSnapshot model with legacy ProcessorAffinity retained alongside optional CpuSelection and migration metadata.
• Extends ProfileModel and CoreMask with optional CpuSelection fields without removing existing legacy fields.
• Adds CpuSelectionMigrationService for testable migration from legacy affinity masks and bool core masks, plus safe legacy-mask build-back only when representable.
• Wires profile save/load to persist/read CpuSelection when a topology snapshot is available, while keeping legacy ProcessorAffinity for compatibility.
• Wires core mask load/save to attach CpuSelection metadata where possible while preserving BoolMask and leaving runtime core-mask apply unchanged.

Out of scope

• No UI changes.
• No profile UI migration or review UI.
• No deletion of legacy fields.
• No preset generator changes.
• No Process Lasso-style registry/IFEO work.
• No priority guardrails.
• No X3D detection.
• No version bump and no tag.
• Core mask runtime auto-apply still uses the existing legacy path; switching it to CpuSelection is left for a later phase.

Tests

• dotnet test "ThreadPilot_1.sln" --configuration Release --no-restore
• Result: 230 passed, 0 failed, 0 skipped.

Existing warnings remain in unrelated test files: CS1998 in RetryPolicyServiceTests and CS0067 in ProcessMonitorManagerServiceTests.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 73.24561% with 61 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
Services/CoreMaskService.cs	0.00%	41 Missing ⚠️
Services/ProcessService.cs	89.39%	3 Missing and 4 partials ⚠️
Services/ServiceConfiguration.cs	0.00%	5 Missing ⚠️
Models/ProfileModel.cs	0.00%	4 Missing ⚠️
Models/CoreMask.cs	50.00%	3 Missing ⚠️
Services/CpuSelectionMigrationService.cs	98.88%	0 Missing and 1 partial ⚠️

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Surface CpuSelection apply failures as exceptions

When CPU-selection application fails, this branch now returns false instead of throwing, which changes error signaling for profile loads. In the existing UI path (ProcessViewModel.LoadProfile), the return value is ignored and only exceptions trigger an error status, so protected/denied affinity applies can silently fail while the user sees a successful load. This regression is triggered whenever SetProcessorAffinity(process, profile.CpuSelection) returns a failed AffinityApplyResult.

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[chatgpt-codex-connector]

Recompute CpuSelection after BoolMask edits

This guard skips migration whenever CpuSelection is already set, so later edits to BoolMask (saved via UpdateMaskAsync -> SaveMasksAsync) do not refresh the persisted CpuSelection. After any mask edit, the file can contain a boolMask and cpuSelection that describe different CPU sets, which will produce incorrect behavior once CpuSelection-based mask application is used.

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