Document successful HDMI hardware validation for 0.2.1

CHANGELOG.md

@@ -13,6 +13,13 @@ All notable changes to this project will be documented here.
 - Add regression coverage for Lua, older Hyprland without `status`, and refresh
   failures before and after the VT switch. Document the Lua startup hook.
 
+### Validated
+
+- 30 behavioral tests, Bash syntax checks and ShellCheck 0.11.0 passed.
+- Full manual recovery completed on the desktop; the operator then confirmed
+  physical HDMI input switching and recovery on Hyprland 0.56.2 with Lua and
+  an iiyama PL3288UH on `HDMI-A-2`. See [validation details](docs/hardware-validation.md).
+
 ## 0.2.0 - 2026-09-23
 
 ### Fixed