API: projects, webhook endpoints and workspace entitlements are in the API reference and SDKs

Three workspace surfaces that Build integrations already rely on are now in the API Reference and the official SDKs:

Projects (/v1/projects): model each of your customers as a project, cap its spend with monthly_budget, pin API keys and members to it, and archive, purge or restore it.
Webhook endpoints (/v1/webhooks/endpoints): subscribe to the workspace.spend_budget.*, project.spend_budget.* and api_key.spend_cap.* events, rotate the signing secret, and read delivery attempts.
Workspace entitlements (GET /v1/workspaces/current/entitlements): what your plan allows, including the TTS request-rate and concurrency limits.

Nothing changes on the wire. These endpoints already answered API-key requests; this release documents them and adds them to the SDKs.

See Spend Limits and Projects for how they fit together.