feat(client): make dir()/help() work through _SyncProxy

The sync REPL proxy forwarded methods via __getattr__, so dir()/tab-completion never saw them and the sync wrapper reported (*args, **kwargs) instead of the real signature. Add __dir__ delegating to the wrapped target, and decorate the async wrapper with functools.wraps so inspect.signature()/help() report the real params + docstring.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/test_sync_proxy.py

@@ -0,0 +1,31 @@
+"""_SyncProxy introspection: dir() and help()/signature must work through the proxy."""
+import asyncio
+import inspect
+from unittest.mock import AsyncMock
+
+from pm3py.core.client import _SyncProxy
+from pm3py.core.hf_iso15 import HF15Commands
+
+
+def _proxy():
+    return _SyncProxy(HF15Commands(AsyncMock()), asyncio.new_event_loop())
+
+
+def test_dir_surfaces_target_methods():
+    d = dir(_proxy())
+    for name in ("scan", "rdbl", "wrbl", "raw_inventory", "sniff"):
+        assert name in d, f"{name} missing from dir(proxy)"
+
+
+def test_wrapped_method_preserves_signature():
+    proxy = _proxy()
+    # signature must be the real params, not the wrapper's (*args, **kwargs)
+    sig = inspect.signature(proxy.rdbl)
+    assert list(sig.parameters) == ["block", "uid"]
+    assert sig.parameters["uid"].default is None
+
+
+def test_wrapped_method_preserves_doc_and_name():
+    proxy = _proxy()
+    assert proxy.rdbl.__name__ == "rdbl"
+    assert proxy.rdbl.__doc__ == "Read a single block."