- **Old artifact addresses open the artifact instead of a dead end (#5240).** `/artifacts/<slug>` now opens the artifact the person can see under that slug and moves to its `/artifacts/<id>` address, keeping `workspace_id`, a `?version=N` pin and `?ref=`. `/artifacts/@<id>`, the CLI's `@<id>` form, moves to `/artifacts/<id>`, and `/pages/<slug>/editor` moves to the editor address instead of the app's 404. An artifact whose ID matches always wins over a slug. For people who cannot open the artifact the answer is unchanged and the same as for one that does not exist.