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Tylon releases
Optional, per flow. A team that ships continuously turns releases off and never meets this screen.

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What a release is

A group of cards of one project, delivered together, with an identity of its own. open while it is being filled; completed once it has shipped — and the tags it wrote sit beside it, one per repository: v1.8.0, v2.3.0, v0.9.4. Three different numbers for one delivery, because each repository keeps its own versioning. There is no single version for something that spans three of them, and inventing one would be a number nobody could act on.

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Freezing

The moment what this ships stops changing. Freezing cuts the branch, so from that second there is an answer to “what is in this release” that cannot drift while somebody is testing it. Afterwards a card joins only through a pick — one card, deliberately — rather than whatever happened to be merged since.
A frozen release is still open. Freezing is not a third state: it is a release that has taken a branch of its own, and it completes the same way.

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Completing

Tags and closes it. Each repository gets its own tag and its own release on the provider, with a changelog built from the cards that were in it. That is the last thing that happens to a release, and the first thing the trunk can be honest about.