fix: defensive qrcode version lookup in compile_all.py --check (#51)

qrcode package may not expose __version__ attribute. Use getattr
with fallback to 'installed' so --check doesn't crash.

compile_all.py

@@ -541,7 +541,7 @@ def check_dependencies():
 
     try:
         import qrcode
-        print(f"  ✅ qrcode        {qrcode.__version__}")
+        print(f"  ✅ qrcode        {getattr(qrcode, '__version__', 'installed')}")
     except ImportError:
         print(f"  ❌ qrcode        NOT FOUND (pip install qrcode)")