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f59e32ff17
ERSDEScheduler now accepts use_karras_sigmas, use_exponential_sigmas, use_beta_sigmas, and use_flow_sigmas, matching the other flow schedulers. The VP path derives alpha/sigma/lambda from the k-diffusion sigma so the karras/beta/exponential transforms can use fractional timesteps; the default schedule is numerically unchanged. use_flow_sigmas triggers flow mode and add_noise tolerates fractional timesteps. Wire the new keys into the ER-SDE presets so the sigma method selector drives them, and cover ER-SDE in the scheduler stability test.