a bare "напомни" asks instead of failing to parse (V-548)

The subjectless-reminder gate has been dead since V-383. It tested
`d.Slots.Text == ""`, and that slot is never empty: fillSlots hands it the
utterance when the model names nothing narrower. Measured on the box on
05-08-2026 — "напомни" alone routed to IntentReminder with Text:напомни,
reached actionReminder, and answered "не получилось разобрать время
напоминания." A parse error for a request he never finished asking about.
"ну напомни же" did the same.

The test is now what the slot CONTAINS. reminderHasSubject discounts the
reminder verb by lemma and the filler particles, and asks whether anything
is left. A day or an hour counts as a subject, which is why this does not
reuse cmd/mavend/reminderbody.go — that one strips the time words too.

filler_particles is the lexicon's 16th set. Not a stopword list: every word
in it is one that cannot BE a reminder's subject.

Measured against the 87-case fixture with and without the change: 65/87
both ways, identical clarify counts, because no case exercised the shape.
So amb-007 "напомни" and amb-008 "ну напомни же" were added, both
want_clarify. At 89 cases the cascade scores 67/89 (75.3% full, 79.8%
intent-only), 3 false clarifies / 1 missed, p50 1.199s — the two new cases
clarify, and nothing else moved. The classifier path still guesses both
(62/89, 8 missed clarify); the gate is on the LLM arm only.

The box needs a rebuild for this to take effect.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SoL7EBdYC5Mhz3DJd49GJy

internal/router/eval/ru_routing_v1.json

@@ -102,6 +102,8 @@
     { "id": "amb-003", "utterance": "ну это", "lang": "ru", "want_clarify": true, "tags": ["ambiguous", "filler"] },
     { "id": "amb-004", "utterance": "сделай это", "lang": "ru", "want_clarify": true, "tags": ["ambiguous", "anaphora"], "note": "unresolved anaphora with an imperative — must not guess an fn" },
     { "id": "amb-005", "utterance": "потом", "lang": "ru", "want_clarify": true, "tags": ["ambiguous", "filler"] },
-    { "id": "amb-006", "utterance": "the thing from earlier", "lang": "en", "want_clarify": true, "tags": ["ambiguous", "anaphora"] }
+    { "id": "amb-006", "utterance": "the thing from earlier", "lang": "en", "want_clarify": true, "tags": ["ambiguous", "anaphora"] },
+    { "id": "amb-007", "utterance": "напомни", "lang": "ru", "want_clarify": true, "tags": ["ambiguous", "reminder"], "note": "the reminder verb and nothing else — she knows the shape of the request and not one thing about it. Answered 'не получилось разобрать время напоминания' on the box until V-548: the subjectless-reminder gate tested Slots.Text == \"\", and fillSlots had put the verb in that slot" },
+    { "id": "amb-008", "utterance": "ну напомни же", "lang": "ru", "want_clarify": true, "tags": ["ambiguous", "reminder", "filler"], "note": "the same request wrapped in particles, which is why filler_particles is a lexicon set — without it the particles read as the subject" }
   ]
 }