get out of dependency hell

Goal: reproduceable dev environments. Current state: python 3.10/3.11 reqd for some deps, installed on converging pc, but jaxlib w/ cuda only global on 3.8, no easy jaxlib w/ cuda via venv.

• Check opt_tools can do jaxlibWithCuda, jax imports w GPU. Update lock
• Pull flake.nix from opt_tools up to encoder dynamics
• Test enc_dyn things on new install
• add docu / update readme enc_dyn

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• Check the parallel compilation / fwd compatibility issue or update nvidia driver