kv: slow-op WARN with pool counters for >500ms redis ops - #403
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Revives the July 7 incident-train branch (rebased onto current main, kv tests green). Redis ops slower than 500ms log a WARN carrying the client pool's counters — pool_timeouts (saturated pool) vs pool_misses (fresh dial) vs neither (stalled established connection) discriminates the failure mode a bare context-deadline error hides.
Covers Get/Set/Del/Incr/Expire. RunScript (the rate-limit Lua path) is not instrumented yet — follow-up candidate.