Restore the documented SDK env credential facade without reintroducing run fallback behavior. Fail closed on GitHub permission resolution, require worker storage at the CLI boundary, and align interpolation names and generated docs.
Model default reasoning explicitly at the provider-route level so always-reasoning endpoints without effort controls receive summary headroom. Cap all summary requests at model output limits and bound retained visible summaries to the original allowance. Reuse builtin catalog fixtures and named budget constants in tests, and document the new model setting.
