feat(kv): activation rotation + packed 4-bit KV cache (#61) - #65

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geisten merged 10 commits into

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feat/rot-kv-cache-fwht-61

Jul 5, 2026

Commits on Jul 5, 2026

feat(kv): opt-in Hadamard (FWHT) rotation for INT8 KV cache (#61)
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test(kv): sweep all four KV modes in bench_kv_quality (#61)
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feat(kv): N-bit low-bit KV quality-sim + INT4/INT2 bench modes (#61)
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test(kv): add KL-divergence metric to bench_kv_quality (#61)
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test(kv): _POSIX_C_SOURCE for setenv on glibc (Pi5) (#61)
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feat(kv): packed symmetric 4-bit KV cache (GEIST_KV_INT4) (#61)
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fix(kv): zero-init int4 unpack buffers for GCC -Werror on Pi5 (#61)
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perf(kv): suppress GCC false positive instead of zero-init int4 buffers (#61)
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docs: note packed INT4 KV mode + rotation in ARCHITECTURE (#61)
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style(kv): drop unrelated clang-format churn in geist.h (#61)
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