fix(kv): v3-4 KV write correctness & data-integrity parity#206

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fix/v3-4-kv-correctness

Commits on Jul 2, 2026

docs(kv): fold KV deep-review corrections (benchmark, pending_wakers, v3-3 scope)
tindangtts
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fix(command): GETDEL must not delete a wrong-type key (data loss)
tindangtts
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fix(command): SET..GET and GETSET must not overwrite a wrong-type key (data loss)
tindangtts
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fix(command): EXPIRE/PEXPIRE non-positive TTL deletes the key + overflow guard
tindangtts
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fix(command): guard TTL and DECRBY integer overflow (panic/wrap -> error)
tindangtts
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style(command): rustfmt v3-4 correctness test additions
tindangtts
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feat(command): add MSETNX with cross-shard reject (CROSSSLOT)
tindangtts
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fix(key,string): reject expiry beyond i64::MAX to prevent negative PTTL wrap
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docs(add): finalize v3-4 milestone doc (review verdict + Finding 1 disclosure)
tindangtts
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fix(shard): persist cross-shard coordinator local leg to owning shard AOF
tindangtts
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