ACCEPT RATE under the served speculative decoder, real chat completions, the
server's own counters, 20 prompts per arm; deltas are paired per prompt
against OFF, cluster bootstrap over prompts.  The second file is the NULL.
  arm       pooled rate      delta pp vs OFF             95% CI  tok/s median  completion tokens
  OFF            0.4310                +0.00 [+0.00, +0.00]         64.44               9574
  OFF2           0.4310                +0.00 [+0.00, +0.00]         63.87               9574
  T              0.4486                +2.72 [-0.06, +5.84]         72.37               9577
  G              0.4441                +1.12 [-1.85, +3.97]         71.99               9506
