Symptom: freshly-added Codex accounts (e.g. davi/gabriel) showed "No quota data"
even when healthy. Root cause: the quota path reuses the access_token without
refreshing rotating providers (#3019, anti Auth0 family-revocation cascade), so a
Codex account whose short-lived access_token has expired can never surface quota
from the sync — the live fetch returns "Codex token expired".
Fix (opt-in, cascade-safe):
- refreshAndUpdateCredentials gains `allowRotatingRefresh` + a pure exported gate
`shouldAttemptRotatingRefresh`. The actual token mint is wrapped in
`serializeRefresh` (one refresh at a time per Auth0 rotation group) — so even N
concurrent per-account requests can never refresh siblings in parallel.
- The BULK scheduler (syncAllProviderLimits, concurrent) keeps the flag OFF →
#3019 fully preserved (guardian test codex-quota-sync-no-proactive-refresh stays
green). Only the on-demand, per-connection path (`GET /api/usage/[connectionId]`)
opts in.
- Frontend: the quota page auto-fetches LIVE on open for the VISIBLE connections
that have no cached quota (scoped to what's on screen — not all connections —
and skips entries already cached), so expired-token Codex accounts surface real
quota automatically and cascade-safely.
Adds unit coverage for the gate (bulk skips rotating, on-demand allows; non-rotating
always eligible). typecheck / lint clean.
e438139b03