docs: signed i8 formulas per role — Q/K/V/Gate/Up/Down encoding + MatVec Complete formulas for building signed i8 distance tables: Q: raw cosine → i8 (extern, no gate) K: silu(gate) × K → cosine → i8 (intern, gate-modulated) V: silu(gate) × V → cosine → i8 (intern, gate-modulated) Gate: raw cosine → i8 (IS the gate, topology reference) Up: silu(gate) × Up → cosine → i8 (strongest effect, 33% Δ) Down: raw cosine → i8 (funnel, receives gated result) Per-role scale factors from Qwopus BF16 measured ranges. Gate gets highest resolution (scale=552) because range is narrowest. Signed MatVec + clamp(0) = excitation/inhibition dynamics. Complete layer_forward_signed() showing gate as NARS trust modulator. https://claude.ai/code/session_01ChLvBfpJS8dQhHxRD4pYNp#119