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Experiments have now seen quantum radiation reaction but cannot yet tell the random-jump picture from the smooth one.","posed_since":"","precise":"For $\\chi \\sim 0.1-1$ the quantum-stochastic description predicts electron energy straggling (growth of energy spread) and quantum quenching, both absent in quantum-continuous models (LL with a Gaunt-factor reduction of the emitted power). In head-on electron-laser collisions with $a0 \\sim 10-100$ and $\\gamma \\sim 1e3-1e4$, measure post-collision electron spectra (energy spread evolution, high-energy tail) or photon spectra with precision sufficient to reject the quantum-continuous model at $5\\,\\sigma$, controlling shot-to-shot jitter in collision timing and overlap.","problem_ref":null,"references":"","settled_by":"A laser-electron collision campaign with measured collision parameters per shot that distinguishes the two quantum models at $5\\,\\sigma$.","status_note":"Los et al. 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