Workspace agents could previously call PATCH /workspaces/:id/budget with their
own bearer token and set budget_limit=null, defeating the entire spend enforcement
feature. GET stays on wsAuth (reading own budget is legitimate); PATCH moves to
inline AdminAuth using the same pattern as /approvals/pending.
No existing tests needed updating — all budget PATCH tests call the handler
directly and are unaffected by router-level middleware changes.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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