Add KnownTags map and GetDynamicTags/GetNegatedDynamicTags methods to extract label-value search filters from parsed queries. Any tag:value pair whose key is not a known system tag (state, author, label) is treated as a dynamic label filter. Add resolve.go with shared helpers: IdentResolver type, ResolveAuthor, ExtractTextFilters, and ResolveDIDLabelValues. These keep resolution logic in the searchquery package without coupling it to idresolver. Signed-off-by: Thomas Karpiniec <tom.karpiniec@outlook.com>