Atlas.WM 4.0.0 — the correction-and-retraction rebuild

Every v3.x headline claim re-verified; two retracted with committed evidence. Rebuilt: environment (box containment), data pipeline (in-memory normalization, fingerprinted splits), reproducibility (seeded training canary), CI gates, training objective (VICReg + prediction grounding + K-step rollouts), belief encoder (engineered dynamics features → first positive learned physics ID), active exploration (+39% belief quality from data collection alone), causal belief conditioning, dissipative symplectic head (honest negative), MuJoCo environment tier, uv lockfile, fail-closed checkpoint verification.

Full ledger: CHANGELOG.md · docs/MODEL_CARD.md · docs/v4.0-ROADMAP.md · PRs #25–#44.