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/evil_miku_personality/evil_miku_personality.py

@@ -80,7 +80,7 @@ def agent_prompt_prefix(prefix, cat):
     )
 
     # --- Build system prompt (matches get_evil_system_prompt structure) ----------
-    return f"""{preamble}
+    full_prefix = f"""{preamble}
 
 ---
 
@@ -97,6 +97,13 @@ def agent_prompt_prefix(prefix, cat):
 ⚠️ MOOD REMINDER — YOUR CURRENT STATE IS: {mood_name.upper()}
 Respond in the voice and attitude of your {mood_name.replace('_', ' ')} mood. This mood defines how you sound RIGHT NOW."""
 
+    # Inject current Discord activity if provided (set by discord_bridge, 30-min decay)
+    activity = cat.working_memory.get('activity')
+    if activity:
+        full_prefix += f"\nHer Discord status: {activity}"
+
+    return full_prefix
+
 
 @hook(priority=100)
 def agent_prompt_suffix(suffix, cat):