feat(engine): opt-in prewarm Chromium spare with smoke matrix and hardening #220

Job	Run time
Hadolint	6s
Run unit tests	40s
Spectral	20s
Docker smoke image (linux/amd64, cache)	1m 22s
Ruff	7s
Lint	4s
Smoke (prewarm=false, cold)	1m 3s
Smoke (prewarm=true, warm-handoff)	59s
	4m 41s

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