Artifact publishing retries more reliably and reports when it merged over a newer version

What

Artifacts are files Claude Code publishes so they can be viewed or shared. This release changes how publishing works:

• Retries now wait according to the server's retry-after hint plus a small random delay, and a relay-unavailable response also triggers a retry. Before, the delay only came from retry-after, with a cap.
• Claude Code now keeps track of its own version and any merged version of a publish.
• A publish response can include merged_over, which describes the base version, the live version, and the files that were changed or left out.
• When a publish was merged over a newer version, the result shown to Claude now says so, lists the changed and removed files, and tells it to re-read them before editing.
• File reads now include a title, and the relay request can ask for compression with a compress option.

Why

Publishing should fail less often during brief server outages. The merged-over note stops Claude from overwriting files that changed elsewhere, because it is told to read the newer content first.