Simplify how parallel workers are fed tests - #141
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`Test` defines no `__bool__`, so every instance is always truthy.
Workers drain naturally when the queue empties rather than checking an abort flag on every dispatch. The queue is cleared at the point where the failure is recorded, which is where the abort decision logically belongs.
Isolates the alternatives-expansion logic from the dispatch loop so the upcoming generator conversion of `nextTests` stays readable.
Replaces the `None`-sentinel protocol with a generator that yields individual tests. The worker loop simplifies to a plain `for` and the `saveTiming` call moves to after the loop, so the timing file is read and written once per worker rather than once per test. Reruns appended to the queue by `testFailed` are picked up naturally on the next outer `while True` iteration.
Align with the snake_case convention used throughout the newer parts of the codebase.
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We were using a pretty elaborate protocol with lists and
Nonesentinel values. This PR simplifies so tests now read from a simple generator which encapsulates all the logic. We also do some adjacent cleanups.