fix(agentgateway): comment non-403 fragment skip path (py-el-02)

Author: tiagoek

src/sap_cloud_sdk/agentgateway/_lob.py

@@ -405,6 +405,7 @@ async def get_mcp_tools_lob(
                     fragment_name,
                 )
                 continue
+            # intentional: fragment failure must not abort remaining fragments
             logger.exception(
                 "Failed to load tools from fragment '%s' — skipping",
                 fragment_name,