Rundown Studio API v0 deprecated

This is the legacy v0 API. It was deprecated on July 1, 2026 and will be shut down on July 1, 2028. It still works until then, but it is frozen — no new features, critical fixes only. Every response also carries Deprecation, Sunset, and a successor-version Link header.

New integrations should use Rundown Studio API v1 — a full data plane, one response envelope, and an interactive reference. Its landing page links to the reference and the OpenAPI spec.