Document JAX PPO ladder results

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positive_expeditions_mean=0.41796875
```
Static-opponent gate results, measured on 2026-07-04 with 10,000 fixed shuffles
and duplicate seat-swapped evaluation:
| Gate | Opponent | Result | Win rate (Wilson 95%) | Mean score diff | Mean length | Positive expeditions/game |
| --- | --- | --- | --- | ---: | ---: | ---: |
| 1 | `discard_only` | PASS | 1.00000 [0.99981, 1.00000] | 204.56335 | 82.45495 | 3.2783 |
| 2 | `heuristic_balanced` | PASS | 0.98655 [0.98486, 0.98806] | 116.83400 | 167.81450 | 3.9573 |
| 3 | `heuristic_cautious` | PASS | 0.95955 [0.95673, 0.96219] | 142.89930 | 185.38690 | 4.0946 |
Large PPO artifacts are written under
`/mnt/2tbhdd/coolrl-lost-cities-artifacts/jax-ppo-static-opponents/`.
Generated checkpoints and evaluation JSON are not committed to git.
Generated checkpoints and evaluation JSON are not committed to git. The full
run summary is in
[docs/reports/jax-ppo-static-opponent-ladder-2026-07-04.md](docs/reports/jax-ppo-static-opponent-ladder-2026-07-04.md).
## Basic Usage