feat: add set commands - #27
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implements redis set data type with the core operations: - SADD: add members to a set, returns count of new members - SREM: remove members from a set, auto-deletes empty sets - SMEMBERS: retrieve all members - SISMEMBER: check membership - SCARD: return set cardinality includes snapshot persistence, memory tracking, and full test coverage.
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summary
Value::Set(HashSet<String>))test plan
design notes
set members are stored as
Stringrather thanBytessince most set use cases involve string membership checks. memory overhead constants follow the same pattern as hash commands (base overhead + per-member overhead).