transformerless_lm: theme momentum + v56 results

Theme momentum primitive: per-token substrate signature from char
codes via Fibonacci-frequency cosine basis + phi-decay. Running theme
= F(k)/phi^(pi*k) weighted average over last F(7)=13 tokens.
Bias next token by 1/(1+L1) similarity to theme (Subsim metric
surfaced at sampling time). Bounded [1/phi, phi]. Pure substrate.

v56 results (phase + threading): peak 0.648, mean 0.614.
Cycle 3 produced "this seat of Mars" (Richard II line).

Author: claude