perf: stabilize V3 with a single serving engine - #260
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Description
Removes the experimental V3 overlay search path that caused large-dictionary search p95 and peak RSS regressions. V3 now rebuilds and atomically serves one immutable engine for each version while preserving the public API and existing Redis manifest/chunk format.
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Checklist
make test)make vetmake lint)make build)Additional Notes
DeltaSearchand related status fields remain for source compatibility but report disabled/zero. Fresh verification:make allandgo test ./...passed; 1092 tests passed across 9 packages.