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DNSWATCHER_DNS_INTERVAL and DNSWATCHER_TLS_INTERVAL were parsed with time.ParseDuration and silently replaced by the default when that failed, so a value like 5 or 1d gave hourly checks with no hint why, and zero or negative values were accepted. Both now go through parseInterval, which returns an error naming the variable and the value, and startup stops the same way it does for invalid targets. An unset or empty variable still gets its default from setupViper. The three tests that pinned the old fallback are replaced. The README says what a valid value looks like. Model: opus-5-5