The nightly HA sync runs via shell_command in the Core container, not the SSH
add-on where install ran. Core has an empty known_hosts, so git push failed
"Host key verification failed" — the commit was made locally but never reached
GitHub. install.sh now seeds a repo-local known_hosts (ssh-keyscan) and pins
git config core.sshCommand so every context (add-on, Core, cron) uses the same
working ssh. Also drops a stray `.git-sync` arg from the pre-commit chmod line.
Records LESSON-06 + a symptom-table row in SKILL.md and SKILL.ru.md; CHANGELOG
Fixed entry. Field-validated on a live Home Assistant.
Circuit 1: real git in /config (deploy key, pre-commit secret scanner,
meaningful commits). Circuit 2: age-encrypted native HA backups in GitHub
Releases with rotation and a mandatory monthly restore drill. Ships
install/sync/scan/offsite/restore scripts, HA automations/snippets,
setup + architecture + incident + runbook references, EN + RU skill docs.
README/README.ru gain an ops-companion bullet in Scenario 3;
CHANGELOG [Unreleased] Added entry (no version bump).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Nikolay Miroshnichenko