perf(agents): reduce subagent streaming overhead - #202
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Multiple active subagents persisted every streamed text update and made the client repeatedly fold the same activity history. That multiplied server, SQLite, WebSocket, route, and renderer work during parallel agent runs.
This change coalesces only in-progress child result updates while keeping the first update immediate and lifecycle/final updates lossless. It also derives all client subagent views in one pass and limits detailed activity subscriptions to an open child inspector.
Measured result:
Validation: