reorganize: move all test scripts to tests/ directory

- Moved 8 root-level test scripts + 2 from bot/ to tests/
- Moved run_rocinante_test.sh runner script to tests/
- Added tests/README.md documenting each test's purpose, type, and requirements
- Added test_pfp_context.py and test_rocinante_comparison.py (previously untracked)

tests/test_voice_playback.py

@@ -0,0 +1,51 @@
+#!/usr/bin/env python3
+"""
+Test audio playback in an active voice session.
+This sends text to the TTS and should be heard in Discord voice.
+"""
+
+import asyncio
+import sys
+sys.path.insert(0, '/app')
+
+from utils.voice_manager import voice_manager
+
+async def test_voice_playback():
+    print("🎤 Testing voice playback in active session...")
+    
+    if not voice_manager.active_session:
+        print("❌ No active voice session! Use '!miku join' first.")
+        return
+    
+    if not voice_manager.active_session.tts_streamer:
+        print("❌ TTS streamer not initialized!")
+        return
+    
+    if not voice_manager.active_session.voice_client:
+        print("❌ Not connected to voice!")
+        return
+    
+    print(f"✓ Active session in: {voice_manager.active_session.voice_channel.name}")
+    print(f"✓ Voice client connected: {voice_manager.active_session.voice_client.is_connected()}")
+    print(f"✓ Voice client playing: {voice_manager.active_session.voice_client.is_playing()}")
+    
+    try:
+        test_text = "Hello! This is a test of the voice chat system."
+        print(f"\n📤 Speaking: '{test_text}'")
+        
+        await voice_manager.active_session.tts_streamer.stream_text(test_text)
+        
+        print("✓ Text sent to TTS!")
+        print("⏳ Audio should be playing in Discord voice channel...")
+        print("   (Wait a few seconds for TTS processing and playback)")
+        
+        await asyncio.sleep(5)
+        print("✅ Test complete!")
+        
+    except Exception as e:
+        print(f"❌ Error: {e}")
+        import traceback
+        traceback.print_exc()
+
+if __name__ == "__main__":
+    asyncio.run(test_voice_playback())