Get caller identity, workspace, and plan
Returns the caller's auth mode, workspace summary, and plan limits in one call. MCP tools use this for plan pre-flight before fat operations like create-form. Three response shapes: - **OAuth-authenticated request**: returns the user's actual workspace and plan tier. - **API key request**: returns the workspace associated with the key. - **No auth**: returns Free defaults. Plan limits are sourced from `PLAN_LIMITS` in `@vid-master/config` (single source of truth).
Identity + plan summary