feat(pm3py): add Proxmark3.sync() for REPL/script usage without async boilerplate

tests/test_integration.py

@@ -52,6 +52,30 @@ def test_mf_rdbl_returns_hex():
     assert result["raw"] == block
 
 
+def test_sync_proxy():
+    """Verify sync proxy wraps async calls."""
+    from pm3py.transport import PM3Response
+    from pm3py.client import _SyncProxy
+
+    pm3 = Proxmark3("/dev/null")
+    loop = asyncio.new_event_loop()
+    proxy = _SyncProxy(pm3, loop)
+
+    # Mock the transport on the command object
+    mock_transport = AsyncMock()
+    proxy._target.hw._t = mock_transport
+    ping_data = bytes(range(32))
+    mock_transport.send_ng.return_value = PM3Response(
+        cmd=Cmd.PING, status=0, reason=0, ng=True, data=ping_data)
+
+    # Call synchronously — no await needed
+    result = proxy.hw.ping(32)
+    assert result["success"] is True
+    assert result["length"] == 32
+
+    loop.close()
+
+
 def test_firmware_probe_compatible():
     """Verify firmware probe populates FirmwareInfo on successful connect."""
     pm3 = Proxmark3("/dev/null")