Legacy legacy_test interface contract: A = (8a + b) U0 with b = (0,-4,4),
omega = +A/R, per-lattice-step EMA reset to zero every 800-step interval,
zero first observation, frozen norm.json, deterministic policy, Legacy
warm-up order. Reuses the DynamisLab model loader and observation
normalizer read-only; writes the f2f88c phase3 signals.npz layout.
Research only; src/ unchanged. Not executed here (no GPU/numpy).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
