The env var ND_SCANSCHEDULE was incorrect - Navidrome uses viper config
with dots replaced by underscores, so scanner.schedule becomes
ND_SCANNER_SCHEDULE. Also explicitly use @every format for clarity.
Also reorders CLAUDE.md rules to emphasize running zk-docs first.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>