Players come from agentenv-game-env's lobby, and its match grades them

[earakely-scale]

Stacked on #18: merge that first.

OpenCiv3's env becomes an agentenv-game-env game env. This tests how well game-env generalizes beyond Warcraft III: OpenCiv3 is turn-based, has many players and has human players.

What changes

• The lobby says who plays. urn:game:lobby/v1 takes:

  • the game's settings: seed, size, difficulty, barbarians, landform, ocean, turn_limit, human_turn_seconds, min_turn_seconds and broadcast;
  • one player slot per civilization, played by an agent, a person or the game's AI.

  An agent's or person's slot takes a civ, and the next free one is used when it names none. The engine picks the AI's civs. Closing the lobby creates the game.

• Routing by address, not header. An agent plays at /players/<player_id>/mcp, which add_player_slot registers with it. X-OpenCiv3-Seat is gone from the env and from the player agents. In a lobby game, the env's own /mcp plays no one.

• A person's token is the slot's secret. It is passed through game-env 0.6.0's new @player_slot_headers hook. add_player_slot puts it in the page link's fragment, and the play page reads it from there.

• The match (urn:game:match/v1) reports:

  • the turns;
  • each player's outcome, by the game's own rules (see below);
  • scores: score, cities, population and techs;
  • moves: turns a player ended itself, and turns the env ended for it.

• Outcome rules:

  • A defeated civilization has lost.
  • A conquest, domination, culture or score victory goes to its civ, and every other player loses.
  • At the turn limit, a tie on top is no one's victory.

• Finishing and files. finish_match plays a match out by ending every remaining player's turn. The match keeps its recording as files, by kind: map_video, html_replay, last_turn and client_video. Its spectator view is /live.

• Tasks.

  • The ten multi-agent tasks and human-vs-ai use open_lobby, add_player_slot, close_lobby, finish_match (with await_match first in a person's game), grade_match and save_match_files.
  • grade_match uses max_missed: 0.1, the victor verifier's rule for an agent that sat out.
  • human-vs-agents grades the person in a second step, without the gate.

• Removed: the openciv3_match and openciv3_await_game steps and the victor verifier.

• Kept on the default game: new-game keeps the single-civilization default game. smoke, play and full-game stay on it, with their baseline verifiers and save_env_recording.

• Broadcast. It stays OpenCiv3's own, now set through the lobby, and agent-env openciv3 stream is unchanged. Banner logos must now be https:// URLs or data: URIs, which the env fetches as the lobby closes.

• Image. The env image installs game-env from the archive that pyproject.toml pins; setup passes it in.

Behaviour changes to know about

• Each agent gets its own grade: 1 for a win, 0.5 for a draw, 0 for a loss. The victor verifier graded the match once.
• An AI civilization's score victory at the turn limit now means every agent lost. The victor verifier ignored AI scores. This applies to sol-vs-opus, which has three AI civs.

Verification

• Local tests: 408 pass. The 93 failures and 22 errors are the same set as on Players survive a long broadcast; a five-model war task; sponsor banners on the stream #18; they need the real engine, which can't run on a Mac without .NET. Ruff is clean.
• Real engine, EC2 Linux, image built from this branch: 493 pass, 20 skipped, none failed. That includes the multi-player seat and HTTP routing tests.
• Real runs (env openciv3-port, Claude Haiku 4.5 players). In every run each agent played at its own slot address and the match files were kept.
  • three-agents-quick, 10 turns: each agent ended 10 of 10 turns itself, and both gates passed. At turn 10, two players tied on top, so no one won, and each agent got 0.5.
  • human-vs-ai, 4 turns: a scripted person played through the play page's API.
    • The link added by add_player_slot served the page.
    • The API refused calls without the token, and accepted them with it.
    • The person ended 4 turns, await_match returned at the end, and the full-game verifier graded it 0.42.
  • showmatch-quick, 6 turns: played with agent-env openciv3 stream --record --offline. The casters commented over the whole game, and the recording is a 32 MB video. Each agent got 0.5 for a three-way tie.
  • playtest/bots.py, 3 seats, 5 turns: 84 tool calls, none failed.

Not in this pass

Casters in game-env's broadcast, so Warcraft III gets casters back.

🤖 Generated with Claude Code