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radvd's DNSSL and kea's domain-search hardcoded the same list of search domains in two places. Hoist it to lib.my.c.home.searchDomains so there is a single source of truth (and so other consumers, such as statically-configured boxes, can reuse it). No change to what is advertised. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>