CPU topology v2 phase 8: add persistent rules engine foundation

[PrimeBuild-pc]

Summary

• Adds foundation models for PersistentProcessRule and PersistentRuleApplyResult.
• Adds a testable persistent rule matcher for process name and executable path matching.
• Adds a foundation PersistentRulesEngine that applies matching saved affinity/priority rules through existing safe services without adding a background loop.
• Adds a small JSON-backed rule store and DI registrations.
• Adds safe persistent-rules copy using the required Apply at process start wording.

Safety scope

• No Windows Service.
• No installer changes.
• No registry affinity or IFEO affinity.
• No anti-cheat bypass promises.
• No preset generator, profile migration, or core-mask migration changes.
• No UI redesign, automatic startup registration, version bump, release notes, tag, or merge.

Tests

• Matcher: process-name, executable-path, path priority, disabled rules, missing process path, null paths.
• Engine: CpuSelection, legacy affinity, priority, Realtime guardrail failure, access denied, anti-cheat/protected, process exited, disabled rules, multiple matching rules.
• Storage: missing file, save/load roundtrip for CpuSelection and legacy affinity, corrupt JSON.

Validation

• dotnet test "ThreadPilot_1.sln" --configuration Release --no-restore
• Result: 260 passed, 0 failed, 0 skipped.

Deferred

• Runtime process-monitor hook for Apply at process start.
• Any Windows Service or startup registration.
• UI management for persistent rules.
• Registry/IFEO persistence expansion.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 89.67136% with 22 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
Services/PersistentRulesEngine.cs	93.38%	1 Missing and 8 partials ⚠️
Services/PersistentProcessRuleJsonStore.cs	82.75%	2 Missing and 3 partials ⚠️
Services/PersistentProcessRuleMatcher.cs	78.94%	2 Missing and 2 partials ⚠️
Services/ServiceConfiguration.cs	0.00%	3 Missing ⚠️
Services/StoragePaths.cs	0.00%	1 Missing ⚠️

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