CHANGELOG: add entry for shellcheck workflow move

Author: dannywillems

CHANGELOG.md

@@ -10,6 +10,8 @@ and this project adheres to
 
 ### Infrastructure
 
+- CI: move shellcheck into its own dedicated workflow, separate from changelog
+  checks ([72bf877], [#65])
 - CI: bump astral-sh/setup-uv from 6 to 7 ([c9216ba], [#64])
 
 ## [2.0.0] - 2026-03-16
@@ -194,6 +196,7 @@ and this project adheres to
 
 <!-- Commit links -->
 
+[72bf877]: https://github.com/LeakIX/l9format-python/commit/72bf877
 [c9216ba]: https://github.com/LeakIX/l9format-python/commit/c9216ba
 [fa582dc]: https://github.com/LeakIX/l9format-python/commit/fa582dc
 [bc4872d]: https://github.com/LeakIX/l9format-python/commit/bc4872d
@@ -293,4 +296,5 @@ and this project adheres to
 [#59]: https://github.com/LeakIX/l9format-python/issues/59
 [#62]: https://github.com/LeakIX/l9format-python/pull/62
 [#64]: https://github.com/LeakIX/l9format-python/pull/64
+[#65]: https://github.com/LeakIX/l9format-python/pull/65
 [#43]: https://github.com/LeakIX/l9format-python/issues/43