Release 0.4.2

Final stability fixes after 0.4.1: Model Error leaves out spans with
unknown inputs; window sensors unknown at startup stay unknown, with last
known states restored as unknown across restarts; unload, reload and
removal can no longer publish stale results or recreate a deleted model;
Forecast Error scores only forecasts whose plan the relay matched within
2 minutes. Adds Reset learned model to Configure. Still observation-only.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -2,11 +2,11 @@
 
 Engineering findings and test evidence behind each change are in [AUDIT.md](AUDIT.md).
 
-## Unreleased — final stability fixes after 0.4.1
+## 0.4.2 — 2026-10-27
 
 Four correctness fixes from an independent review of 0.4.1, and a **Reset learned
-model** action you asked for. The version stays 0.4.1 until released. Still
-**observation-only**: no service calls; the boiler and thermostat are untouched.
+model** action. Still **observation-only**: no service calls; the boiler and
+thermostat are untouched.
 Tested in the Home Assistant Core harness with HA 2025.12.0 and 2026.2.3; not on
 HAOS.