docs(changelog): fragment for #1303

Co-Authored-By: Claude Opus 5.5 <[email protected]>

changelog.d/1303-wind-stale.md

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+- `get_wind` says when it answers from a stale forecast run. When the model
+  upstream fails, the wind proxy keeps serving its last run; the tool now
+  returns `stale` and adds "(forecast may be stale)" instead of giving old
+  wind as current (quanticsoul4772, #1303).