fix: replace falsy check with nullish coalescing for autoReconnect

[shalomberm]

The previous implementation prevented setting autoReconnect to false, as the false value was treated as falsy and always defaulted to true.

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Note

Fix defaulting logic for reconnection flag

• In src/client.ts, updates constructor to use args!.autoReconnect ?? true so autoReconnect=false is respected instead of being overridden by a falsy check.

This ensures explicit false no longer defaults to true.

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