Fix YAML syntax in SkyPilot test (use heredoc for Python blocks)

scripts/cloud/skypilot_test_minimal.yaml

@@ -114,7 +114,7 @@ run: |
 
   # Test 7: Python imports
   echo "🐍 Testing Python imports..."
-  python3 -c "
+  python3 << 'PYTHON_EOF'
 import sys
 import numpy as np
 import soundfile as sf
@@ -131,7 +131,7 @@ print('  ✓ numpy array creation works')
 # Test librosa
 rms = librosa.feature.rms(y=audio)[0].mean()
 print(f'  ✓ librosa feature extraction works (RMS: {rms:.4f})')
-"
+PYTHON_EOF
   echo ""
 
   # Test 8: Synthetic data generation (1 sample)
@@ -151,7 +151,7 @@ print(f'  ✓ librosa feature extraction works (RMS: {rms:.4f})')
 
   # Test audio loading
   FIRST_AUDIO=$(find test_data_tmp -name "*.wav" | head -1)
-  python3 -c "
+  python3 << PYTHON_EOF2
 import soundfile as sf
 import librosa
 
@@ -160,12 +160,12 @@ print(f'  ✓ Audio loading works: {len(audio)/sr:.1f}s @ {sr}Hz')
 
 rms = librosa.feature.rms(y=audio)[0].mean()
 print(f'  ✓ Feature extraction: RMS={rms:.4f}')
-"
+PYTHON_EOF2
   echo ""
 
   # Test 9: Voting system
   echo "🗳️  Testing ensemble voting..."
-  python3 -c "
+  python3 << 'PYTHON_EOF3'
 import sys
 sys.path.insert(0, '.')
 
@@ -180,8 +180,8 @@ predictions = [
 voter = WeightedVoting()
 result = voter.vote(predictions, key='label')
 
-print(f'  ✓ Voting works: {result[\"label\"]} ({result[\"confidence\"]:.2%})')
-"
+print(f'  ✓ Voting works: {result["label"]} ({result["confidence"]:.2%})')
+PYTHON_EOF3
   echo ""
 
   # Cleanup