D31/D32: ids, topics, retain and availability for the HA MQTT interface, MVP entity list. D33: MVP notification via the notify entity. D34: configuration file format. D35: shipping libmosquitto. D36: NFR-3 measurement. D37: MVP implemented in four iterations, DSH-1 first. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>