zhi 86fdc63802 fix: moderator presence reconnect loop ...

Root causes:
1. Multiple plugin subsystems each called startModeratorPresence,
   creating competing WebSocket connections to the same bot token.
   Discord only allows one connection per bot → 4008 rate limit →
   infinite reconnect loop (1000+ connects → token reset by Discord)

2. Invalid session (op 9) handler called scheduleReconnect, but the
   new connection would also get kicked → cascading reconnects

Fixes:
- Singleton guard: startModeratorPresence is a no-op if already started
- cleanup() nullifies old ws handlers before creating new connection
- Stale ws check: all callbacks verify they belong to current ws
- Exponential backoff with cap (max 60s) instead of fixed 2-5s delay
- heartbeat ACK tracking: detect zombie connections
- Non-recoverable codes (4004) properly stop all reconnection

2026-02-28 18:49:17 +00:00

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