docs(changelog): OpenAI Realtime voice tool patterns (#1638)

changelog.d/1638-openai-realtime-tool-patterns.md

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+- Voice on OpenAI connects again: OpenAI Realtime refused every session, so
+  the mic failed with "Failed to create Realtime token", because
+  `resolve_area`'s area-id pattern uses Unicode classes it no longer accepts.
+  Voice leaves those patterns out, as typed chat does; area ids are still
+  checked before the tool runs (avaldini, #1638).