fix(ws): prevent goroutine leaks in hub Unregister and RedisBridge close

[cypriannwokolo2-creator]

Summary

hub.go:104,129 spawn go h.Unregister per full buffer and RedisBridge.Close() (redis_bridge.go:29-31) closes stop but the subscribe goroutine may block forever.

Acceptance Criteria

• Deterministic unregister without per-buffer goroutines
• RedisBridge consume goroutine reliably exits on Close
• Leak tests (goroutine count)

Complexity

High.

[Kenlachy]

@Kenlachy has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi maintainer, I’d love to work on this issue. I’ve reviewed the requirements and I’m ready to get started. Please consider assigning it to me.

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[benedict-cmd]

@benedict-cmd has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hey I am a developer please assign me to this issue and I'll deliver more than expected

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[Gabbydunkk]

@Gabbydunkk has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Pls assign to me

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