fix: remove pragma no cover from except branch now covered by test

The except Exception handler in _handle_sse_response is now exercised
by the new test, so strict-no-cover rejects the pragma.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: kxbnb

src/mcp/client/streamable_http.py

@@ -358,7 +358,7 @@ async def _handle_sse_response(
                     await response.aclose()
                     return  # Normal completion, no reconnect needed
         except Exception:
-            logger.debug("SSE stream ended", exc_info=True)  # pragma: no cover
+            logger.debug("SSE stream ended", exc_info=True)
 
         # Stream ended without response - reconnect if we have an event ID,
         # otherwise notify the session that the connection is dead (#1811)