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/autonomous.py

@@ -184,6 +184,9 @@ async def _check_and_react(guild_id: int, message):
     Check if Miku should react to a new message with an emoji.
     Called for each new message in real-time.
     """
+    if _autonomous_paused:
+        return
+
     # Calculate message age
     from datetime import datetime, timezone
     message_age = (datetime.now(timezone.utc) - message.created_at).total_seconds()
@@ -211,6 +214,9 @@ async def _check_and_act(guild_id: int):
     Uses per-guild lock to prevent race conditions from near-simultaneous messages.
     """
     async with _get_action_lock(guild_id):
+        if _autonomous_paused:
+            return
+
         # Rate limiting check
         now = time.time()
         if guild_id in _last_action_execution: