small laminar improvement: keep

conversation

object out of Laminar tool span input (it gets logged as a python object with memory pointer) github.com/OpenHands/software-agent-sdk/pull/4379

{"action": {"command": "echo hi", "kind": "TerminalAction", ...},
 "conversation": "<openhands.sdk.conversation.impl.local_conversation.LocalConversation object at 0x13950f8c0>"}