fix(coderd/x/chatd): avoid closing poller hint channels (#28746) - #28977
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Closes SEC-515 Prevent a `send on closed channel` panic when a chat stream unregisters during polling. The poller no longer owns or closes subscriber channels. This is safe because delivery is guarded by the stream context, and unregister removes the subscriber from future polls. (cherry picked from commit ced03dc)
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mtojek
approved these changes
Sep 4, 2026
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Backport of #28746
Original PR: #28746 — fix(coderd/x/chatd): avoid closing poller hint channels
Merge commit: ced03dc
Requested by: @ethanndickson