Phase C of model-access (ADR 0050). Refresh above calls an in-process
VendorRefresher, which would open the at-rest envelope inside the control
plane's own process. Anthropic must not: its refresh runs on the manager
node. So add SubmitRefresh, the companion that publishes a refresh a
manager node already performed -- it is given only the new access token in
the clear (sealed per holder, as any accepted key) and an opaque re-sealed
refresh envelope (stored unopened). The refresh token in the clear never
crosses this boundary. The reseal-and-publish half is extracted and shared
with Refresh, so the sealing logic is one implementation.
CLI: licence grant (print the opaque envelope), set-grant (store a
module-produced envelope -- adoption), submit-refresh (access token +
optional rotated envelope). Tests defend that the manager alone opens the
refresh token and the control plane never holds it in the clear.
Claude-Session: https://claude.ai/code/session_01LrgweAeERJYBg88c5cKDzF
