feat(064): codify Reviewer-Liveness Contract in execution-policy schema #2080

Job	Run time
Build Frontend	31s
OAuth E2E Tests	51s
Cross-Platform Logging Tests (windows-latest, $env:LOCALAPPDATA\mcpproxy\logs, Windows Applicatio...	2m 18s
End-to-End Tests (ubuntu-latest, 1.25)	10m 52s
Cross-Platform Logging Tests (ubuntu-latest)	1m 35s
Cross-Platform Logging Tests (macos-latest, $HOME/Library/Logs/mcpproxy, macOS File System Progra...	49s
Integration Tests	5m 13s
Stress Tests	0s
	22m 9s

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