Download Run Artifacts

Streams a ZIP archive with the latest captured version of each artifact path. Stage order, retry number, and then stage ID determine the latest version, matching the artifacts page. Captures from the graph's boundary nodes are excluded, identified by their start and exit handler type rather than by node name.

The archive streams, so the response status is sent before the first artifact is read. A failure after that point aborts the transfer rather than returning 500. The ZIP central directory is written last, so a truncated download does not open as a valid archive.