Add changelog section for v2.0.555 [skip ci]

Author: PEZ

CHANGELOG.md

@@ -4,6 +4,8 @@ Changes to Calva.
 
 ## [Unreleased]
 
+## [2.0.555] - 2026-02-19
+
 - Fix: [Connecting a REPL sequence disconnects the previous prematurely](https://github.com/BetterThanTomorrow/calva/issues/3065)
 - Fix: [Toggle Line Comment produces incorrect output for multi-line selections](https://github.com/BetterThanTomorrow/calva/issues/3066)
 - Fix: [Toggle Line Comment loses the selection when you run the command](https://github.com/BetterThanTomorrow/calva/issues/3067)