fix(ag-ui): scope reasoning timing to its delivery run - #1160
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blove
enabled auto-merge (squash)
September 24, 2026 19:45
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Two AG-UI sessions using the same message ID overwrite each other's reasoning start time because the reducer stores clocks in a module-wide map. Repeated and late reasoning-end events can also change completed durations. Keep one pending start on the owning delivery run, consume it once, and clear it when assistant ownership changes or the run settles. Reasoning events with a conflicting run ID are ignored.
This preserves the current canonical snapshot policy and public API. It removes the global timing map and corrects the reducer's misleading purity comment; it does not add a shared timing service or migrate the AG-UI package root.
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