Complete measured runtime overhead reductions

[PrimeBuild-pc]

Summary

Follow-up to #35, containing the measured P1 and justified P2 work from the performance plan:

• defer inactive Power Plans, Rules, Settings, Tweaks, and Logs page initialization
• reuse the process monitor's startup snapshot
• parse the active plan from powercfg /list, removing redundant powercfg calls
• run the power-plan timer only while the Power Plans page is visible
• suspend hidden Log Viewer collection updates and arm log flushing only when entries are queued
• back off failed WMI recovery attempts (10s, 30s, 60s, 5m)
• reuse static process paths with PID + start-time validation

This PR is intentionally stacked on #35. It does not change version metadata or issue #32 priority verification/retry behavior.

Final measurements vs official v1.4.3

Scenario	Avg CPU	Working set	Handles max	Child processes
visible idle	27.6748% → 28.8136%	301.12 → 299.25 MB	1767 → 1704	27 → 4
hidden idle	0.0878% → 0.0000%	146.10 → 140.24 MB	705 → 622	0 → 0
hidden + 80 process churn	0.2107% → 0.1931%	148.69 → 141.93 MB	707 → 617	0 → 0

The visible CPU delta is within run noise, while foreground child process launches fell from 27 to 4. Hidden CPU reached zero in the idle sample, memory fell 4–5%, and handle maxima fell materially.

Validation

• clean, restore, Release build: 0 warnings/errors
• 581/581 tests passed
• official WinX64-SingleFile publish succeeded
• NuGet audit: no vulnerable packages
• persistent rules, process start/stop, lazy diagnostics, and issue Can't save rule #32 retry tests remain green

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Codecov Report

❌ Patch coverage is 37.96296% with 67 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
MainWindow.Behaviors.partial.cs	0.00%	23 Missing ⚠️
Services/ProcessService.cs	44.82%	15 Missing and 1 partial ⚠️
Services/ProcessMonitorService.cs	34.78%	14 Missing and 1 partial ⚠️
Services/EnhancedLoggingService.cs	16.66%	5 Missing ⚠️
ViewModels/ProcessPowerPlanAssociationViewModel.cs	0.00%	4 Missing and 1 partial ⚠️
ViewModels/LogViewerViewModel.cs	60.00%	2 Missing ⚠️
MainWindow.xaml.cs	0.00%	1 Missing ⚠️

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