A circuit breaker opens after chaos makes a dependency fail repeatedly.
newEngine installs an always-fire error rule on OpHTTPClient. The breaker
(threshold 3) opens after three failed calls; the remaining seven of ten
requests short-circuit without touching the dependency, so the rule fires
exactly three times.
Command circuit-breaker shows a circuit breaker opening after chaos injects
repeated failures, after which calls short-circuit instead of calling the
failing dependency. Run with `go run .`.
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