Use the closest DNS encloser for wildcard synthesis

Review the independently proposed patch below, including its unchanged callers. A wildcard at the zone apex answers below an existing branch that has no wildcard of its own. Restore closest-encloser semantics, including empty nonterminal names and exact owners without the requested record type.

Review focus: Distributed Systems

src/repositories/zone.go

BeforeProposed

+1−1

111111 if !zone.Exists[parent] {

112112 continue

113113 }

114 rows := zone.Records["*."+zone.Origin]

114 rows := zone.Records["*."+parent]

115115 synthesized := make([]models.Record, 0, len(rows))

116116 for _, row := range rows {

117117 row.Name = name

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