Add:

• AddLower, PairwiseAdd/Sub, MaskedAbsOr, BitsFromMask
• AVX10_2 and Loongson LASX/LSX targets
• AVX3_SPR F16, WASM_EMU256 F64 types
• CeilInt/FloorInt, DemoteToNearestInt and F16/F64 NearestInt
• Complex number operations, F16/BF16 assignment operators
• emulated bf16/f16 Load/StoreInterleaved
• hwy::Warn/HWY_WARN, use instead of fprintf
• HWY_UNREACHABLE, HWY_VISIT_TARGETS
• i16 Dot, AverageRound, RoundingShiftRight/RoundingShr
• InterleaveEvenBlocks/InterleaveOddBlocks, MinMagnitude/MaxMagnitude
• masked comparisons, promote, round, GetBiasedExponent
• MulByPow2/MulByFloorPow2, MulRound, MulLower/MulAddLower
• PositiveInfOrHighestValue/NegativeInfOrLowestValue
• RVV groundwork for runtime dispatch, enable tuples
• spin wait, NanoSleep, Counter2/4 barrier, Divisor64, perf_counters

Improvements:

• dpbf16 WidenMulPairwiseAdd Exp2, AVX10.2 float->int, AVX3 GetExponent
• header-only abort.h/cc, tests runnable with Bazel8
• HWY_BROKEN_*: allow individual override
• Lanes: 'optional constexpr', AllBits1
• MaskedEq/Ne, NEON SumOfMulQuadAccumulate, MaskedReduceMin/Max, MulEven
• Profiler: report concurrency stats, 1.36x less overhead
• RVV various ops via superoptimizer
• SetThreadName: support more systems
• SVE2 SatWidenMulPairwiseAccumulate, SSE2/SSSE3 U16 Min/Max
• TargetName: no longer returns unknown for other arch
• ThreadPool autotune, avoid WakeAll
• topology: add NUMA node, support Windows/Apple

Fixes:

• avoid wraparound for -ftrapv, topology for offline CPUs/RVV
• warnings from -Wmissing-declarations/prototypes
• AdvSIMD_HPFPCvt on OSX
• f32->bf16 rounding: avoid unspecified built-in cast
• MSAN, PPC InvariantTicksPerSecond on QEMU, HWY_RCAST_ALIGNED, IsNaN
• vqsort for ascending order, add 8-bit test

Thanks to all contributors, especially johnplatts and eustas!