instances.yaml pointed "ken" at the piha container (homeassistant5), a
pre-migration instance that never actually stopped running — it kept
firing automations in parallel with the real home instance (HAOS on a
dedicated RPi4, 192.168.31.7), causing duplicate triggers on shared
buttons/scenes. Repoint ken to the real instance (api adapter),
demote the container to ken-legacy (archived, import-only, never a
deploy target), and log the incident in DESIGN.md.
