feat(harness): add onRound callback for agent heartbeat persistence - #1
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…ersistence Add optional onRound(state: AgentLoopState) callback that fires after each round in both sync and streaming agent loop paths. State includes round number, tool call count, finish reason, text content, and hasToolCalls flag — enough data for orchestrator to write heartbeat.json per round and final.json on completion.
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Summary
onRound(state: AgentLoopState)callback toAgentLoopInputinterfaceheartbeat.jsonper round +final.jsonon completion/failure)Test plan
tsc --noEmit— zero errorsvitest run— 25 passed, 5 skipped (integration tests requiring API keys)Files changed
src/agent.ts— addedonRoundtoAgentLoopInput, fires at end of each round in sync path and stream path (tool execution, no-tool-call exit, max-steps exit)