Add changelog entry for PR #809

Co-authored-by: brendan <brendan@sourcebot.dev>

Author: cursoragent

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+- Fixed issue where searching for refs/heads/<default_branch> would return no matches. [#809](https://github.com/sourcebot-dev/sourcebot/pull/809)
+
 ## [4.10.19] - 2026-01-28
 
 ### Fixed