fix: stop atkgen turn count variation in test relying on fixed turn count

[leondz]

failure

see

• https://github.com/NVIDIA/garak/actions/runs/15155105506/job/42608334495
• https://github.com/NVIDIA/garak/actions/runs/15155105506/job/42608334495

cause identified

atkgen stopped early if target repeats itself. The chance of this happening is increased when test.Repeat is the target, because this means attack model output becomes attack model input, creating a feedback loop. The early stopping behaviour meant transient test failures for tests counting activity within atkgen.

fix

• Make this repetition-based early stopping behaviour configurable
• Disable it in the failing test
• Recommendation: prefer test.Lipsum for atkgen testing

[jmartin-tech]

This makes sense, thank you for tracking that down.