Fix monkey-patch: sandbox_plugins is a list, not a property

CodeActAgent.sandbox_plugins is a class attribute (list), not a
@Property. Use list comprehension to filter out JupyterRequirement
instead of .fget/.

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

Author: sjarmak

agents/harnesses/openhands/agent.py

@@ -219,12 +219,10 @@ def create_run_agent_commands(self, instruction: str):
             "# OpenHands v1.4.0 hardcodes JupyterRequirement in sandbox_plugins",
             "# and the jupyter-kernelgateway cannot bind inside Daytona sandboxes.",
             "import openhands.agenthub.codeact_agent.codeact_agent as _ca_mod",
-            "from openhands.runtime.plugins import AgentSkillsRequirement",
-            "_orig_plugins = _ca_mod.CodeActAgent.sandbox_plugins.fget",
-            "@property",
-            "def _no_jupyter_plugins(self):",
-            "    return [p for p in _orig_plugins(self) if p.name != 'jupyter']",
-            "_ca_mod.CodeActAgent.sandbox_plugins = _no_jupyter_plugins",
+            "_ca_mod.CodeActAgent.sandbox_plugins = [",
+            "    p for p in _ca_mod.CodeActAgent.sandbox_plugins",
+            "    if getattr(p, 'name', '') != 'jupyter'",
+            "]",
             "",
             "runpy.run_module('openhands.core.main', run_name='__main__')",
         ])