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exchange now issues an access+refresh pair (RFC 6749 §4.1.4/§5.1) via token.sx issue_grant; added the refresh grant (§6) delegating to token rotation. End-to-end: code-exchange → refresh → introspect (active), refresh-token reuse rejected (invalid_grant), and revoke-then-refresh blocked by grant cascade. oauth 17/17, 65/65. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>