fix: add coverage pragmas for version-dependent resumption test lines

Lines 1307-1309 (post-cancel assertions) are not reached on Python 3.14
due to cancel scope behavior. The ClientSession async with on line 1327
has an untaken exit branch. Mark accordingly with lax no cover and no
branch pragmas.

Author: maxisbey

tests/shared/test_streamable_http.py

@@ -1304,9 +1304,9 @@ async def run_tool():
 
             # Verify we received exactly one notification (inside ClientSession
             # so coverage tracks these on Python 3.11, see PR #1897 for details)
-            assert len(captured_notifications) == 1
-            assert isinstance(captured_notifications[0], types.LoggingMessageNotification)
-            assert captured_notifications[0].params.data == "First notification before lock"
+            assert len(captured_notifications) == 1  # pragma: lax no cover
+            assert isinstance(captured_notifications[0], types.LoggingMessageNotification)  # pragma: lax no cover
+            assert captured_notifications[0].params.data == "First notification before lock"  # pragma: lax no cover
 
     # Clear notifications and set up headers for phase 2 (between connections,
     # not tracked by coverage on Python 3.11 due to cancel scope + sys.settrace bug)
@@ -1324,7 +1324,9 @@ async def run_tool():
             write_stream,
             _,
         ):
-            async with ClientSession(read_stream, write_stream, message_handler=message_handler) as session:
+            async with ClientSession(
+                read_stream, write_stream, message_handler=message_handler
+            ) as session:  # pragma: no branch
                 result = await session.send_request(
                     types.CallToolRequest(params=types.CallToolRequestParams(name="release_lock", arguments={})),
                     types.CallToolResult,