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## What changed - Emit started and completed collaboration tool events for multi-agent v2 `spawn_agent` calls, including failed invocations. - Record execution duration and successful child-agent configuration metadata without including the spawn prompt. - Deduplicate collaboration and subagent activity items by call ID when calculating per-turn subagent tool counts. ## Testing - Extend the app-server multi-agent v2 integration test to cover successful and failed spawn telemetry, duration, prompt omission, and turn counts. GitOrigin-RevId: c1c2fb9cc2a1a9b0f63ef68509ad36d11a92d1e5