Baseline types: LegacyRouter interface (satisfied by *router.Router),
LegacyCase with PrerouteConsumed flag for command-prohibition detection,
LegacyReport with fast-path/residual/router-residual/pre-route breakdowns,
ContrastFamilyReport for per-transform-family scoring.
Test helpers: buildSeededClassifier (hash embedder seeded from
models/seeds/*.txt), actVerbList, seed file loading.
TestContrastFamiliesShareSplitGroup verifies that all contrastive
variants of one base seed share exactly one SplitGroup, preventing
train/eval leakage across the contrast family split.
claude
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