Disable replay recording in make_robocode (record_ratio: 0)

The round-robin only needs per-battle scores to fit Elo; recording every sim
wrote ~8.7MB of compressed replay XML per pair (~59GB over 6670 pairs, risking
disk exhaustion mid-run) and pinned a gzip core on each log copy. Scores come
from results_*.txt, which is unaffected.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: john-b-yang

configs/ablations/ladder/make_robocode.yaml

@@ -14,6 +14,10 @@ game:
   name: RoboCode
   sims_per_round: 300
   sim_concurrency: 5
+  # Ranking only needs per-battle scores (results_*.txt), not replays. Recording every sim writes
+  # ~8.7MB of compressed replay XML per pair (~59GB over 6670 pairs) and pins a gzip core on every
+  # log copy, so disable it here.
+  record_ratio: 0
   args:
     nodisplay: true
     nosound: true