fix(P2): 5 priority-2 bug fixes — emoji consolidation, DM safety, pause gap

#10  Redundant coin flip in join_conversation — removed the 50% random
     gate that doubled the V2 engine's own decision to act.

#11  Message-triggered actions skip _autonomous_paused — _check_and_act
     and _check_and_react now bail out immediately when the autonomous
     system is paused (voice session), matching the scheduled-tick path.

#12  Duplicate emoji dictionaries — removed MOOD_EMOJIS and
     EVIL_MOOD_EMOJIS from globals.py (had different emojis from moods.py).
     bipolar_mode.py and evil_mode.py now import the canonical dicts
     from utils/moods.py so all code sees the same emojis.

#13  DM mood can spontaneously become 'asleep' — rotate_dm_mood() now
     filters 'asleep' out of the candidate list since DMs have no
     sleepy-to-asleep transition guard and no wakeup timer.

#15  Engage-user fallback misreports action type — log level raised to
     WARNING with an explicit [engage_user->general] prefix so the
     cooldown-triggered fallback is visible in logs.

bot/utils/bipolar_mode.py

@@ -404,8 +404,9 @@ async def update_webhook_avatars(client):
 
 def get_miku_display_name() -> str:
     """Get Regular Miku's display name with mood and emoji"""
+    from utils.moods import MOOD_EMOJIS
     mood = globals.DM_MOOD
-    emoji = globals.MOOD_EMOJIS.get(mood, "")
+    emoji = MOOD_EMOJIS.get(mood, "")
     if emoji:
         return f"Hatsune Miku {emoji}"
     return "Hatsune Miku"
@@ -413,8 +414,9 @@ def get_miku_display_name() -> str:
 
 def get_evil_miku_display_name() -> str:
     """Get Evil Miku's display name with mood and emoji"""
+    from utils.moods import EVIL_MOOD_EMOJIS
     mood = globals.EVIL_DM_MOOD
-    emoji = globals.EVIL_MOOD_EMOJIS.get(mood, "")
+    emoji = EVIL_MOOD_EMOJIS.get(mood, "")
     if emoji:
         return f"Evil Miku {emoji}"
     return "Evil Miku"