fix: add type ignore and fix test_exceptions.py import

ROOT CAUSE:
1. tests/shared/test_exceptions.py still had old "from builtins" import
2. Missing # type: ignore[import-not-found] on exceptiongroup imports
   caused pyright errors

CHANGES:
- Fixed test_exceptions.py to use try/except import pattern
- Added # type: ignore[import-not-found] to all exceptiongroup imports

IMPACT:
CI should now pass on all Python versions

FILES MODIFIED:
- tests/shared/test_exceptions.py
- src/mcp/client/_memory.py
- src/mcp/client/session_group.py
- src/mcp/client/sse.py
- src/mcp/client/stdio.py
- src/mcp/client/streamable_http.py
- src/mcp/client/websocket.py
- src/mcp/server/sse.py
- src/mcp/server/stdio.py
- src/mcp/server/streamable_http_manager.py
- src/mcp/server/streamable_http.py
- src/mcp/server/websocket.py
- src/mcp/shared/exceptions.py
- src/mcp/server/lowlevel/server.py
- src/mcp/server/experimental/task_support.py
- src/mcp/server/experimental/task_result_handler.py

Author: peter-luminova

src/mcp/client/_memory.py

@@ -5,7 +5,7 @@
 try:
     from builtins import BaseExceptionGroup
 except ImportError:
-    from exceptiongroup import BaseExceptionGroup
+    from exceptiongroup import BaseExceptionGroup  # type: ignore[import-not-found]
 from collections.abc import AsyncIterator
 from contextlib import AbstractAsyncContextManager, asynccontextmanager
 from types import TracebackType

src/mcp/client/session_group.py

@@ -12,7 +12,7 @@
 try:
     from builtins import BaseExceptionGroup
 except ImportError:
-    from exceptiongroup import BaseExceptionGroup
+    from exceptiongroup import BaseExceptionGroup  # type: ignore[import-not-found]
 from collections.abc import Callable
 from dataclasses import dataclass
 from types import TracebackType

src/mcp/client/sse.py

@@ -3,7 +3,7 @@
 try:
     from builtins import BaseExceptionGroup
 except ImportError:
-    from exceptiongroup import BaseExceptionGroup
+    from exceptiongroup import BaseExceptionGroup  # type: ignore[import-not-found]
 from collections.abc import Callable
 from contextlib import asynccontextmanager
 from typing import Any

src/mcp/client/stdio.py

@@ -5,7 +5,7 @@
 try:
     from builtins import BaseExceptionGroup
 except ImportError:
-    from exceptiongroup import BaseExceptionGroup
+    from exceptiongroup import BaseExceptionGroup  # type: ignore[import-not-found]
 from contextlib import asynccontextmanager
 from pathlib import Path
 from typing import Literal, TextIO

src/mcp/client/streamable_http.py

@@ -8,7 +8,7 @@
 try:
     from builtins import BaseExceptionGroup
 except ImportError:
-    from exceptiongroup import BaseExceptionGroup
+    from exceptiongroup import BaseExceptionGroup  # type: ignore[import-not-found]
 from collections.abc import AsyncGenerator, Awaitable, Callable
 from contextlib import asynccontextmanager
 from dataclasses import dataclass

src/mcp/client/websocket.py

@@ -3,7 +3,7 @@
 try:
     from builtins import BaseExceptionGroup
 except ImportError:
-    from exceptiongroup import BaseExceptionGroup
+    from exceptiongroup import BaseExceptionGroup  # type: ignore[import-not-found]
 from collections.abc import AsyncGenerator
 from contextlib import asynccontextmanager
 

src/mcp/server/experimental/task_result_handler.py

@@ -14,7 +14,7 @@
 try:
     from builtins import BaseExceptionGroup
 except ImportError:
-    from exceptiongroup import BaseExceptionGroup
+    from exceptiongroup import BaseExceptionGroup  # type: ignore[import-not-found]
 from typing import Any
 
 import anyio

src/mcp/server/experimental/task_support.py

@@ -7,7 +7,7 @@
 try:
     from builtins import BaseExceptionGroup
 except ImportError:
-    from exceptiongroup import BaseExceptionGroup
+    from exceptiongroup import BaseExceptionGroup  # type: ignore[import-not-found]
 from collections.abc import AsyncIterator
 from contextlib import asynccontextmanager
 from dataclasses import dataclass, field

src/mcp/server/lowlevel/server.py

@@ -43,7 +43,7 @@ async def main():
 try:
     from builtins import BaseExceptionGroup
 except ImportError:
-    from exceptiongroup import BaseExceptionGroup
+    from exceptiongroup import BaseExceptionGroup  # type: ignore[import-not-found]
 from collections.abc import AsyncIterator, Awaitable, Callable
 from contextlib import AbstractAsyncContextManager, AsyncExitStack, asynccontextmanager
 from importlib.metadata import version as importlib_version

src/mcp/server/sse.py

@@ -41,7 +41,7 @@ async def handle_sse(request):
 try:
     from builtins import BaseExceptionGroup
 except ImportError:
-    from exceptiongroup import BaseExceptionGroup
+    from exceptiongroup import BaseExceptionGroup  # type: ignore[import-not-found]
 from contextlib import asynccontextmanager
 from typing import Any
 from urllib.parse import quote