## What changed
- Recognize `ent26` in authentication, account protocol, backend rate-limit
payloads, and generated app-server schemas.
- Treat it as an enterprise workspace plan for cloud-config eligibility and
business-style usage-limit guidance.
- Cover token parsing, serialization, backend mapping, plan classification,
cloud-config access, and usage-limit formatting with tests.
GitOrigin-RevId: 537d897c8b1d80bcdb66d0fd402563fbb8c5a277