Add headless AI tournament mode for statistical benchmarking

[Copilot]

No built-in way to compare AI strategies across many games — only real-time play was possible, making it impractical to measure win-rate edges.

Changes

• tournament.js (new): Headless game simulation engine + HTML overlay UI

  • AI_REGISTRY auto-detects all loaded AI functions at page load — new AIs are picked up automatically
  • Simulates battles, supply, and turn advancement directly (no CreateJS dependency), running ~100 games near-instantly via setTimeout batching to keep the browser responsive
  • Shows Results by AI (aggregate win % across all slots using that AI) and Results by Player Slot (per-slot breakdown to surface positional bias)

• index.html: Tournament overlay div + CSS, tournament.js script tag, "Tournament / Benchmark" link below canvas

• main.js: TOURNAMENT button added to title screen (button index 8)

UI

Configuration panel — player count (2–7), games (1–10,000), AI assignment per slot:

Results after 100 games (default 7-player config):

ai_defensive shows a clear edge (~50%+ win rate) vs. ai_default (~28%) and ai_example (~19%) in the default 7-player setup.

Original prompt

can you make a way to quickly have different aid play against each other to determine which ones have statistical edges?

---

🔒 GitHub Advanced Security automatically protects Copilot coding agent pull requests. You can protect all pull requests by enabling Advanced Security for your repositories. Learn more about Advanced Security.