Lower mute thresholds and order warnings before chat replies

- spike_mute: 0.8→0.7, mute: 0.75→0.65 so escalating users get
  timed out after a warning instead of endlessly warned
- Skip debounce on @mentions so sentiment analysis fires immediately
- Chat cog awaits pending sentiment analysis before replying,
  ensuring warnings/mutes appear before the personality response

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cogs/sentiment.py

@@ -96,8 +96,12 @@ class SentimentCog(commands.Cog):
         if existing_task and not existing_task.done():
             existing_task.cancel()
 
-        # Start new debounce timer
-        batch_window = config.get("sentiment", {}).get("batch_window_seconds", 3)
+        # Skip debounce when bot is @mentioned so warnings fire before chat replies
+        if self.bot.user in message.mentions:
+            batch_window = 0
+        else:
+            batch_window = config.get("sentiment", {}).get("batch_window_seconds", 3)
+
         self._debounce_tasks[key] = asyncio.create_task(
             self._debounce_then_process(key, batch_window)
         )