TokenPayload gains optional wid (workspace_id) and role claims;
create_access_token accepts them as keyword-only args and only
encodes them when provided. Existing tokens and existing callers
keep working unchanged — the contract that protected requests
must carry wid is enforced by middleware (PR4 T4.6/T4.7), not by
the JWT type system.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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