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POST /api/test/run takes an optional iterations count (the PWA's Iterations field): the run repeats, successful iterations are discarded (steps/log cleared, only load.done and the timing grow), the first error stops the loop and keeps that iteration's report, a stop ends it after the current iteration, and a card session change between iterations is an error. The SCP80 counter state is shared across iterations, so packets continue from what the previous run consumed. The status gains a load block (iteration/done/failed_iteration/ elapsed_ms/avg_ms; disabled for a normal run). The suite runner was split into a per-iteration body (_test_suite_execute_once) + the single-run finaliser, and two load workers own the loops. Review fixes: a raised runner error finalises as error (no stuck running state), a suite-internal session change is an error, a stopped member ends the suite loop, the final status keeps a warning from any iteration, avg_ms covers the attempted iterations, and each suite iteration's counters_before is read fresh. 1041 Python + 1069 frontend; simple-v475.