fix(client): add super().__init__() calls to all mixins for proper initialization

- Add super().__init__() to AuthenticationMixin, HttpMixin, and CacheMixin
- Add super().__init__() to ConnectionManagementMixin and MemoryManagementMixin
- Fixes AttributeError: 'ProjectX' object has no attribute 'api_call_count'
- Ensures proper initialization order in multiple inheritance hierarchy

All mixins now properly call super().__init__() to ensure parent classes are initialized

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: TexasCoding

src/project_x_py/client/auth.py

@@ -23,6 +23,7 @@ class AuthenticationMixin:
 
     def __init__(self) -> None:
         """Initialize authentication attributes."""
+        super().__init__()
         self.session_token = ""
         self.token_expiry: datetime.datetime | None = None
         self._authenticated = False

src/project_x_py/client/cache.py

@@ -20,6 +20,7 @@ class CacheMixin:
 
     def __init__(self) -> None:
         """Initialize cache attributes."""
+        super().__init__()
         # Cache for instrument data (symbol -> instrument)
         self._instrument_cache: dict[str, Instrument] = {}
         self._instrument_cache_time: dict[str, float] = {}

src/project_x_py/client/http.py

@@ -26,6 +26,7 @@ class HttpMixin:
 
     def __init__(self) -> None:
         """Initialize HTTP client attributes."""
+        super().__init__()
         self._client: httpx.AsyncClient | None = None
         self.api_call_count = 0
 

src/project_x_py/realtime/connection_management.py

@@ -19,6 +19,7 @@ class ConnectionManagementMixin:
 
     def __init__(self) -> None:
         """Initialize connection management attributes."""
+        super().__init__()
         self._loop: asyncio.AbstractEventLoop | None = None
 
     async def setup_connections(self: "ProjectXRealtimeClientProtocol") -> None:

src/project_x_py/realtime_data_manager/memory_management.py

@@ -18,6 +18,7 @@ class MemoryManagementMixin:
 
     def __init__(self) -> None:
         """Initialize memory management attributes."""
+        super().__init__()
         self._cleanup_task: asyncio.Task[None] | None = None
 
     async def _cleanup_old_data(self: "RealtimeDataManagerProtocol") -> None: