Preserve context across conversation intents (V-542)

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internal/lexicon/lexicon_ru_v1.json

@@ -262,6 +262,13 @@
         "cancel", "nevermind", "forget"
       ]
     },
+    "conversation_verbs": {
+      "note": "The verbs Maven accepts after a cooperative marker as an explicit request to converse: «давай поговорим», «давай поболтаем», «let's talk». This is her control vocabulary, like capture_verbs, not a claim to list every way humans can converse. Russian forms are matched by lemma, so one infinitive covers tense and number; English is exact because the Russian dictionary leaves it unchanged.",
+      "words": [
+        "говорить", "поговорить", "болтать", "поболтать", "общаться", "пообщаться",
+        "talk", "chat"
+      ]
+    },
     "confirm_yes": {
       "note": "The whole vocabulary of saying yes to a parked confirm, Russian and English. Closed because it is her question that is being answered: she asked \"да или нет\", and the answers to that question can be listed. Matched as whole tokens and never as substrings — \"погода\", \"давление\" and \"дальше\" all contain \"да\", and a substring test executed a destructive act when he asked about the weather (V-567). Words that merely sound agreeable — \"хорошо\", \"ладно\", \"точно\" — are deliberately absent: they open a sentence about something else as often as they answer, and an unclear answer must route rather than execute.",
       "words": [