Add changelog section for v2.0.558 [skip ci]

Author: PEZ

CHANGELOG.md

@@ -4,6 +4,8 @@ Changes to Calva.
 
 ## [Unreleased]
 
+## [2.0.558] - 2026-02-20
+
 - Add dedicated Re-Jack-In command that preserves the current REPL configuration on restart
 
 ## [2.0.557] - 2026-02-20