iomgaa
bc4683d1f5
The concurrency case used two RetryMW instances, so instance-level sharing was hidden by object isolation and a clock promoted to an instance attribute passed all seven cases. Both cases now reuse one mw, and a new one idles past the window between two calls on that instance — the shape that would expose _entered_at pinned to process start. Mutation-checked: promoting the clock fails the new case.