GLE Mechanics

See the dedicated tutorial gle-colored-noise for the call site and the “one drift serves all” claim.

The construction (white-noise critically damps one frequency; GLE uses number of auxiliary (N_s) momenta + optimal_sampling_drift matrix A so the spectrum is flat on [omega0, 100*omega0], BAB propagator, stationary reseed, exact matrix_exp + ldl_sqrt) lives in eindir (GleThermostat) and is consumed verbatim by src/methods/gle_langevin.rs.

Because the GLE object is a pure filling of the Move slot, thermostat variants (different canonical form, a-la-carte correctness vs acceleration, new drift fitting) can be reused by gradient drivers without touching the classical presets or the orchestrator.