Ported from 342d44efe (backup/event-token-lazy-resolution-pre-rewrite) and
adapted to the current in-place single 401 refresh+retry design:
- portal source: classify ticket/dial/read/ack failures via portalStageError
and reconnect with backoff on retryable stages only (DisableReconnect for
tests and one-shot callers); stage errors never leak response bodies
- personal/portal: transient token provider or refresh failures (network,
408/429/5xx) go through the reconnect loop instead of killing the source;
terminal failures (400/401/403) remain fatal
- personalRetryLogError: token resolution/refresh errors log only the
structured HTTP status, never provider error details
Unlike the original commit, a rejected token is still retried once in place
after a successful refresh, and a second 401 stays fatal (single-refresh
guard agreed in review).
zhengyubai