maaz519 2c61f49de1 docs(env): document REDIS_URL — it now also gates cross-replica presence
REDIS_URL was read by the code but absent from .env.example. Beyond the socket.io
fan-out it now selects RedisPresenceService, so leaving it unset in a multi-replica
deploy silently degrades the notification presence gate to per-process.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-25 16:43:03 +05:30
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