V1 to V4 Migration

V1 was removed before general availability. V4 is the only supported public API generation.

Release Policy

• Public REST and headless endpoints are served from /v4/*.
• Requests to /v1/* return 410 Gone with code: "api_version_removed".
• Hosted route execution (/r/:tenantSlug/:workspaceSlug/:workflowSlug) remains unchanged.

Required Actions

1. Update all API clients and SDK usage to /v4/*.
2. Regenerate client code from V4 OpenAPI contracts.
3. Validate staging and production smoke tests against .ai domains.

Notes

• DriftGate V4 is long-lived and additive-only after launch.
• No dual-run /v1 compatibility mode is provided.