v2.6 — Multi-horizon QR-TD3 critic. DiverseCritic reorganised around two orthogonal axes: nstep_horizons [4, 8, 12, 16] → 4 horizon heads, num_quantiles 32 → per-head distribution granularity. Critic output becomes (B, N, 4, 32) — 128 values per symbol per critic. Per-head quantile Huber loss on a shared τ grid; twin-min / q_crossing / CVaR operate per horizon; equal-nq assert across heads.
v2.4.4-mini / v2.4.18-mini — Capacity-compressed cells of the 2×2 CSC matrix.
v2.4.18 — Symmetric CrossSampleCenter, per-sym distributional Q, world-model + CEM planner.
v2.4 — N-agnostic refactor: branch / V_global separation; global Q (q1g / q2g) removed.
v2.3 — Surgical fixes on v2.1: separate encoders, qg_new.detach().
v2.2 — Minimalist refactor under Simple_encoder.
v2.1 — Adapter rank-collapse fix, bias accumulation control, ResidualSkipHead actor.
v2 — Initial release.