v0.1.0

Atlas Core refactor and first public release.\n\nHighlights:\n- New src/atlas_core package layout with clear training/data/reward/runtime/integrations boundaries and CLI entrypoints.\n- Docker-based reproducible environment and updated installation docs.\n- Hydra config reorg (data/model/recipe/trainer/reward) plus RIM naming clarity.\n- Offline trace reward path and pipeline fixes; compatibility updates for atlas-sdk handoff.