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router: a Russian verb is a whole sentence, not thin evidence

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The clarify gate thinned any one-word utterance to 0.3 confidence, which
trips the stage-3 gate and comes back as "не совсем поняла". That is an
English intuition. Russian packs subject, tense and gender into one word,
so "поужинал" is a complete report and "привет" a complete greeting, and
both got clarified.

thinSingleToken keeps the rule for bare nominals, where it is real ("вода"
is a fact-or-query coin flip), and spares two classes: a closed lexicon of
social and control singles, and any token carrying a verb ending. Both
tests are offline.

Fixture: false clarifies 3 → 2, intent-only 74.0% → 75.3%, full accuracy
unchanged at 70.1%, missed clarify still 1.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TrVSBKe3RFDF4fGYKWYQnX
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2026-08-01 21:29:21 +04:00
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@@ -102,8 +102,16 @@ Re-measured on the fixture after the fix: **missed clarify 6/6 → 1**, at the c
clarifies and 2.6pt of full accuracy (72.7% → 70.1%, intent-only 67.5% → 74.0%). Two of the
three false clarifies are acts the model mis-routed and the gate caught — asking beats wrongly
executing, so the fixture and the daemon disagree about what is correct there. The third,
`"поужинал"`, is a real defect: **the single-token rule is an English intuition and does not
transfer to Russian**, where one word is routinely a whole sentence. Narrow or drop it.
`"поужинал"`, was a real defect: the single-token rule was an English intuition and does not
transfer to Russian, where one word is routinely a whole sentence.
Narrowed 01-08-2026. `thinSingleToken` (`internal/router/singletoken.go`) still thins a bare
one-word nominal — "вода", "бэкап" — but spares two classes: a closed lexicon of social and
control singles ("привет", "спасибо", "стоп", "yes"), and any token carrying a Russian verb
ending (past tense, 2nd person, reflexive), because a verb already contains its subject. Both
tests are offline and cost nothing. Re-measured: **false clarifies 3 → 2, intent-only 74.0% →
75.3%, full accuracy unchanged at 70.1%, missed clarify still 1.** The two remaining false
clarifies are the act-with-no-allowlisted-fn arm of the gate, not this rule.
## LLM output contract