docs: promote Unreleased to v0.9.2 in CHANGELOG.md

Author: github-actions[bot]

CHANGELOG.md

@@ -39,6 +39,8 @@ minor versions, as the README states. Releases before v0.2.0 predate this file.
 
 ## Unreleased
 
+## v0.9.2 — 2026-08-21
+
 ### Fixed
 
 - `Scene.Elevations` / `Scene.ElevationsWith` / `Scene.ElevationOn` no longer admit a