docs: update type terminology from Int/Float/String/Bool to Number/Decimal/Text/Boolean

docs/SBIR-CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to the Storybook Intermediate Representation format.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+> **Note:** As of v0.3.0, value type names have been renamed: Int→Number,
+> Float→Decimal, String→Text, Bool→Boolean. Historical entries below use the
+> original terminology from their respective versions.
+
 ---
 
 ## [0.2.0] - 2026-02-13