Create a Workspace

Workbench creates a Workspace through a reviewable flow rather than an immediate mutation.

Describe -> Blueprint -> Recipe -> Audit -> Preview -> Review -> Confirm -> Created

What each stage does

1. Describe collects the name, goal, audience, and primary tasks.
2. Blueprint proposes the initial page and capability plan.
3. Recipe selects a visual and layout baseline.
4. Audit identifies requirements, warnings, and errors.
5. Preview produces a typed WorkspaceCreationDraft without changing state.
6. Review shows pages, Plugin plan, requirements, side effects, and expiration.
7. Confirm obtains Host preparation and explicit user confirmation.
8. Created is reported only after Host validation and mutation succeed.

A documentation Preview is not execution permission. The Host rechecks authority, principal, trust, permissions, draft signature, expiry, and idempotency before calling the mutation owner.