Fix vision pipeline: ffmpeg removal by autoremove, increase vision timeout, reduce frame count, add Discord activity awareness

- bot/Dockerfile: Add ffmpeg to reinstall line after apt-get autoremove
  (autoremove was sweeping up ffmpeg as 'no longer needed' after playwright install)
- bot/utils/image_handling.py: Increase video analysis timeout 120s→300s, 6→3 for Tenor GIFs (GTX 1660 VRAM constraint)
- bot/utils/activities.py: Add _activity_changed_at timestamp tracking,
  get_current_activity_label() and get_current_activity_fresh() with 30-min decay
- bot/utils/cat_client.py: Pass current Discord activity to Cheshire Cat pipeline
- bot/utils/llm.py: Inject current Discord activity into system prompt
- cat-plugins/*: Forward Discord activity through working_memory to personality plugins
- bot/persona/*/preamble.txt: Add Discord status usage guidelines for character prompts
- llama-swap-rocm-config.yaml: Add qwen3.5 model entry for ComfyUI prompt generation
- AGENTS.md: New project documentation file

cat-plugins/discord_bridge/discord_bridge.py

@@ -43,6 +43,7 @@ def before_cat_reads_message(user_message_json: dict, cat) -> dict:
     response_type = user_message_json.get('discord_response_type', None)
     evil_mode = user_message_json.get('discord_evil_mode', False)
     media_type = user_message_json.get('discord_media_type', None)
+    activity = user_message_json.get('discord_activity', None)
 
     # Also check working memory for backward compatibility
     if not guild_id:
@@ -55,6 +56,7 @@ def before_cat_reads_message(user_message_json: dict, cat) -> dict:
     cat.working_memory['response_type'] = response_type
     cat.working_memory['evil_mode'] = evil_mode
     cat.working_memory['media_type'] = media_type
+    cat.working_memory['activity'] = activity
     
     return user_message_json
 
@@ -351,6 +353,12 @@ Respond in the voice and attitude of your {mood_name.replace('_', ' ')} mood. Th
 Miku is currently feeling: {mood_description}
 Please respond in a way that reflects this emotional tone."""
 
+        # Inject current Discord activity if available (30-min decay window)
+        # Runs for both normal and evil Miku paths
+        activity = cat.working_memory.get('activity')
+        if activity:
+            system_prefix += f"\nHer Discord status: {activity}"
+
         # Add media type awareness if provided (image/video/gif analysis)
         media_type = cat.working_memory.get('media_type', None)
         if media_type: