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When a Docker client canceled a slow /auth/token request mid-refresh, the token-refresh POST was aborted client-side but completed on the PDS, which rotated the refresh token. The rotated token was never received or persisted, so the next refresh replayed the consumed token, got invalid_grant, and the session (OAuth + UI) was deleted, signing the user out everywhere. - Detach refresh POSTs from the inbound request context via a per-session RoundTripper (WithoutCancel + 30s cap); once a refresh starts it completes - Persist session updates (rotated tokens, DPoP nonces) on a detached context - Gate session deletion on IsSessionInvalidError: cancellation, timeouts, and transport errors no longer delete sessions; genuine invalid_grant still does - Add phase timing to /auth/token and per-DID lock wait warnings to attribute the ~14s pre-refresh stalls that push requests past Docker's deadline Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>