feat(agricogla): win-rate round scoring (1 for the winner, 0 otherwise), 50 episodes/round

[daveey]

Note: this reopens the change from #53. #53 was merged prematurely (before review) and immediately reverted on main (revert commit b63e437). This PR is the same change, now awaiting your approval before any merge.

What

Two changes to how the agricogla Coworld league scores competition rounds, requested by daveey:

• Scoring → win rate. Add a third round_score mode, win, alongside mean/rank. Each episode's top scorer earns 1 and everyone else 0 (a tie for first shares the win), and a policy's round score is its win rate across the episodes it played — so the league rewards winning games outright, not placement or margin.
• 50 episodes/round (was 100).

win is not expressible by config alone (only mean/rank existed), so this adds the mode to the ruleset_strategy commissioner and flips configs/agricogla.yaml.

Changes

File	Change
common/utils.py	New WIN_EPISODE_ROUND_SCORE_KIND + mechanics copy; _episode_win_points (1 for the top score, ties shared); generalized _rank_points_lists_by_policy → _episode_points_lists_by_policy(results, fn) so rank & win share the per-policy aggregation
common/ruleset_strategy/config.py	round_score: Literal["mean","rank","win"]; round_score_kind & scoring_mechanics handle win
common/ruleset_strategy/commissioner.py	_round_scores_by_policy routes rank/win through the shared aggregator; falls back to super only for mean
configs/agricogla.yaml	round_score: win, episodes: 50 (was rank / 100) + header
tests/test_commissioner_strategies.py	New test_ruleset_strategy_win_round_score_uses_binary_win_points, incl. a tie-for-first case (both tied seats win)

Tie semantics

Top-scorer(s) get 1; a tie for first means all top scorers get 1 (consistent with agricogla's "ties share the win" rule and with rank-mode tie handling).

Verification

• tests/test_commissioner_strategies.py — 72 passed locally.
• Config parses: episodes=50, round_score=win, kind=win_episode_round_score.

Deploy follow-up (after merge)

1. Merge → CI publishes ghcr.io/metta-ai/commissioners-agricogla:latest + :coworld-<sha> and prints the new @sha256: digest.
2. In metta, bump the digest in packages/cogweb/games/agricogla/coworld/compose.yaml (and fix its stale … episodes/round … rank comment).
3. Rebuild + re-upload the agricogla coworld (coworld build → certify → upload-coworld).

🤖 Generated with Claude Code

[daveey]

Landed on main via unrevert (commit 1100663) per repo owner. Closing this PR as redundant; the win-mode + 50 episodes is now on main.