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Fix notification processing order

Notifications were being processed concurrently, causing them to be handled out of order. This fix serializes notification processing through a dedicated queue and processing goroutine, ensuring notifications are handled in the exact order they are received.

Problem

When multiple notifications arrived in quick succession (e.g., streaming session updates), each notification spawned its own goroutine for processing. Due to goroutine scheduling, notifications could complete in a different order than they were received, breaking applications that depend on ordered message processing.

Solution

  • Added notificationQueue channel to serialize notification processing
  • Created processNotifications() goroutine that processes notifications sequentially
  • Modified receive() loop to queue notifications instead of processing them concurrently

Changes

  • Connection struct: Added notificationQueue chan *anyMessage field
  • NewConnection(): Starts processNotifications() goroutine
  • receive(): Queues notifications instead of spawning goroutines
  • processNotifications(): New method that sequentially processes queued notifications

Testing

  • All existing tests pass (except TestPromptCancellationSendsCancelAndAllowsNewSession which has a pre-existing timing issue)
  • Verified with real-world usage where message ordering is now correct

Backward Compatibility

Fully backward compatible - public API unchanged, only internal processing order modified.

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@codex review pls

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Codex Review: Didn't find any major issues. What shall we delve into next?

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