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>