Without this, an unrecoverable failure such as TokenInvalid causes the
gateway listener to restart ~10x/sec, which Discord's Cloudflare layer
treats as abuse and answers with a multi-hour IP block. Both the clean-
expiry path and the error path now share a backoff that doubles up to
1h, with a >5min healthy run resetting the counter.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
