Reduce foreground and background runtime overhead

[PrimeBuild-pc]

Summary

• cache persistent process-rule snapshots in RAM with serialized load/save access
• pre-match process-start events by name before path/full process enrichment
• stop persistent Information logging for irrelevant process starts
• dispose System.Diagnostics.Process handles and materialize process enumerations
• clear all PID-scoped runtime caches when any process exits

P0 only. This does not change power-plan refresh, ViewModel initialization, logging/WMI timers, version metadata, or persistent-priority verification/retry behavior from #32.

Measurements

Release measurements used the same WinX64-SingleFile profile as the official workflow and identical one-second sampling scenarios.

Scenario	Avg CPU before	Avg CPU after	Delta	Handles end	Handles max
visible idle	27.6748%	30.0053%	+8.4%	1705 → 1674	1767 → 1740
hidden idle	0.0878%	0.0176%	-80.0%	698 → 691	705 → 703
hidden + 80 process churn	0.2107%	0.1404%	-33.4%	691 → 687	707 → 703

Memory remained effectively flat in the targeted hidden scenarios (+0.4% working set hidden idle, +0.6% under churn). The visible run observed four extra existing schtasks.exe/power child commands (31 vs 27), so its CPU delta is noisy and outside P0's background process-start target.

Validation

• Release build: 0 warnings, 0 errors
• 569/569 tests passed
• official-method single-file publish succeeded
• changed-file formatter verification passed
• NuGet vulnerability audit found no vulnerable packages

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Codecov Report

❌ Patch coverage is 57.25191% with 56 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
Services/ProcessService.cs	36.84%	24 Missing ⚠️
Services/PersistentProcessRuleJsonStore.cs	61.29%	4 Missing and 8 partials ⚠️
Services/ProcessMonitorService.cs	0.00%	10 Missing ⚠️
Services/PersistentRuleAutoApplyService.cs	70.96%	7 Missing and 2 partials ⚠️
Services/ProcessMonitorManagerService.cs	95.23%	1 Missing ⚠️

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