Document non-Error normalization in onError changelog notes

Co-authored-by: Eric Allam <eric@trigger.dev>

Author: cursoragent

packages/ai/CHANGELOG.md

@@ -14,3 +14,4 @@
 - Added explicit helper option types for chat send/reconnect request inputs.
 - Added optional `onError` callback support for observing non-fatal transport issues.
 - Added phase-aware `onError` reporting across send, reconnect, and stream-consumption paths.
+- Added normalization of non-Error throw values into Error instances before `onError` reporting.