96fbeb04ef
HA expects \`name\` and \`unit_system\` as keys of the top-level \`homeassistant:\` block, not as top-level integration names. Recent HA versions tightened config validation, so this surfaced as "Integration 'unit_system' not found" / "Integration 'name' not found" warnings, blocking the automation reload that runs after saving an automation in the UI. Pre-existing bug, unrelated to OTBR — surfaced now because automation edits trigger strict validation. Bonus: NixOS auto-populates \`time_zone\` from the system locale once \`homeassistant\` is a real block. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>