Phase 4: Sandbox — All Three Platforms (macOS/Linux/Windows) #29

Job	Run time
Lint (fmt + clippy + deny + audit)	52s
Test (windows-latest)	4m 12s
Frontend (ui)	4s
DCO signoff check	7s
Test (ubuntu-latest)	2m 22s
Test (macos-14)	3m 15s
Parity gate (EVAL-01) — scaffolded, not run in P1	0s
Block unsigned tag on release	0s
	10m 52s

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