- SetClosing(): send moved out of the s.Lock() critical section, performed via select/default to tolerate stalled receivers and concurrent CloseC that may have closed the channel.
- Closing channel: changed from unbuffered (make(chan bool)) to buffered size 1 (make(chan bool, 1)) in NewSubscription. Pairs with the s.Closed guard (single send per subscription), so the sender never parks.
* feat: update lightpush API to make pubSubTopic optional as per autosharding
* Extract contentFilter and subscriptions out of filter to reuse in relay (#779)
* chore: extract contentFilter outside filter package
* chore: move subscription outside of filter so that it can be modified and reused for relay
* Feat: filter select peer for sharding (#783)
* update selectPeer to support pubsubTopic based selection
