Mirror Deep CFR training metrics to W&B via a new WandbRunTracker wired through CompositeRunTracker; wandb is an optional extra so default installs and runs stay unchanged. Train CLI gains --wandb/--wandb-project/--wandb-mode/--wandb-name/--wandb-tag, and train() now closes the tracker in a finally block so runs finalize even on early exit. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>