Greyson LaLonde 6136228a66 fix: scope streaming handlers to prevent cross-run chunk contamination ...

Concurrent streaming runs registered handlers on the singleton event bus
that received all LLMStreamChunkEvent emissions, causing chunks to fan
out across unrelated queues. Introduces a ContextVar-based stream scope
ID so each handler only accepts events from its own execution context.

Closes #5376

2026-04-17 03:02:03 +08:00

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