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Coming soon. Not in this release. This page says what the feature is, so that the shape is public before the code is.
Build your own view of a run against a published contract, instead of holding the run and folding its events yourself. A run already knows everything worth watching: which step is running, what each one decided, what a reviewer found, what the whole thing has spent. Today a host reads that by holding the run and folding the events itself. An observation port will make it a contract: a stream of the run’s events, and a published shape for the state they fold into. The run’s own page becomes one consumer of it, and a view built against the shape keeps working when that page changes.

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