Release 0.4.1

Stability and correctness after 0.4.0: unknown window states are no longer
read as closed; learned coefficients are reset selectively when the
configuration they were learned under changes; plans are discarded when an
input changed during optimization, and an overtaken run never publishes;
model accuracy (Model Error) is separated from the accuracy of published
forecasts (new Forecast Error sensor). Base coefficients report confidence;
sensor weights are labelled in the zone form. 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 — stability and correctness
+## 0.4.1 — 2026-10-27
 
-Fixes four correctness problems found in 0.4.0 and separates model accuracy from
-forecast accuracy. No new product features; the version stays 0.4.0 until
-released. Still **observation-only**. Tested in the Home Assistant Core harness
+Stability and correctness: fixes four problems found in 0.4.0 and separates model
+accuracy from forecast accuracy. No new product features. Still
+**observation-only**. Tested in the Home Assistant Core harness
 with HA 2025.12.0 and 2026.2.3; not yet on HAOS.
 
 ### Upgrade notes