README media

Every file the README embeds. A placeholder is a generated SVG whose caption says what the real image or screen recording must show; replace the file, keep the name.

File	Kind	Shows / must show
checkpoints.svg	image placeholder	Reproducible checkpoints (planned) - A checkpoint's contents listed (policy, critic, optimizer, pool index, env config, seeds) and a resumed run's curve lying exactly on the original's
family.svg	diagram	the repos and how they depend on each other, RoyaleImitate included; final
frozen-pool-ladder.svg	image placeholder	Frozen-pool ladder (planned) - Every pool snapshot's Elo with its confidence bar, the learner's current rating, and the win-rate gate line a snapshot must clear to enter the pool
metrics-sink.svg	image placeholder	Metrics from both sides (planned) - One Weights & Biases run: ticks/s, env-steps/s, episode length, crowns, illegal-action rate from the engine; loss, KL, entropy, Elo from the learner
ppo-learner.png	drawn figure	One masked head over 2305 actions - The mask of one decision drawn as one board per hand card, illegal tiles dark, and the card the elixir bar cannot pay for masked whole. Drawn by RoyaleGym's docs/media/_shot_action_mask.py; the step is searched for, not the first
rollout-workers.svg	image placeholder	Rollout workers (planned) - A throughput panel: N games stepping as one batch of 2N player slots, env-steps/s and engine ticks/s rising as workers are added
self-play-env.png	real still	already final
training-run.svg	video placeholder	A training run, watched live (planned) - The learner's Elo against the frozen pool with confidence bands, beside loss, entropy and env-steps/s, over one run from the first snapshot to the gate opening