Automatic core spans from reactor events (CL-5171) - #305
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Maps reactor events to nested perf spans: turn contains inference, which contains inference.ttft and inference.stream when stream deltas arrive; tool spans nest under turn. Wired always-on in createRunSink alongside the existing turn collector so coarse durationMs is unchanged.
Interrupt mid-inference or mid-tool must not nest the next call under a stale turn or leave orphan tool spans. Route all turn-close paths through one closeTurn helper (closeOpenTools + end turn) and cover abandon restart paths in tests.
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Stack
PerfTrace stack 2/8 — base:
stack/w1a-cl-5160-perftrace-core(#303)Linear
https://linear.app/abklabs/issue/CL-5171/automatic-core-spans-from-reactor-events
Summary
Wire automatic PerfTrace spans from reactor events (turn, inference, tools, etc.) so every session produces a span tree without manual instrumentation.
Test evidence
Merge note
Merge after #303 (CL-5160).