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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.
A run already knows everything worth watching: which step is running, what each one decided, what a reviewer sent back, what the whole thing has spent. Today a host reads that by holding the run and folding its events itself. An observation port makes it a contract instead: a stream of the run’s events, and a published shape for the state they fold into. Our own view becomes one consumer of it rather than the only way to see a run, and a view built against the shape keeps working when ours changes. See Watch a run in the browser.