Two reporting tests over the 91-case RU fixture, no ratchet: a ratchet here
would freeze a number nobody has decided to hold.
TestStage0Contention runs the 21 grammars one at a time instead of stopping
at the first match. One case of 91 draws two, ru-query-019, where
calendar-query beats agenda-query by list position alone.
TestONNXClaimConfidenceDistribution buckets the reported confidence by the
layer that produced it. Stage 0 is 20/20 at a hardcoded 1.0. The classifier
scores 62% below its median and 62% above, across a cosine range of 0.859
to 0.942, with a top-two margin of p50 0.009. The float is not a confidence.
newBaselineClassifier and baselineGrammars split out of newBaselineRouter so
the measurement runs the same rules the daemon runs. TestONNXBaseline is
unchanged at 64/91.
