Pairing /claim creates a fleet server and /lookup reveals a pending agent's
details; both were @jwt_required() only, so any authenticated user (incl. a
read-only viewer) could use them. Gate both with @developer_required to match
POST /servers. Test: viewer 403, developer clears the gate.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
