Teknium 3b509da571 feat: auto-reconnect failed gateway platforms with exponential backoff (#2584) ...

When a messaging platform fails to connect at startup (e.g. transient DNS
failure) or disconnects at runtime with a retryable error, the gateway now
queues it for background reconnection instead of giving up permanently.

- New _platform_reconnect_watcher background task runs alongside the
  existing session expiry watcher
- Exponential backoff: 30s, 60s, 120s, 240s, 300s cap
- Max 20 retry attempts before giving up on a platform
- Non-retryable errors (bad auth token, etc.) are not retried
- Runtime disconnections via _handle_adapter_fatal_error now queue
  retryable failures instead of triggering gateway shutdown
- On successful reconnect, adapter is wired up and channel directory
  is rebuilt automatically

Fixes the case where a DNS blip during gateway startup caused Telegram
and Discord to be permanently unavailable until manual restart.

2026-03-22 23:48:24 -07:00

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