feat(engine): opt-in prewarm Chromium spare with smoke matrix and hardening #219

Job	Run time
Docker smoke image (linux/amd64, cache)	2m 40s
Hadolint	8s
Ruff	8s
Spectral	12s
Run unit tests	41s
Lint	2s
Smoke (prewarm=true, warm-handoff)	55s
Smoke (prewarm=false, cold)	55s
	5m 41s

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