Fix the smoke job: npx --package does not do what I assumed

Boot the game in a real browser in CI — the one thing 2502 tests cannot see

Cut 1.1.0, un-deprecate the CI actions, and run the browser smoke test

Get CI green, and make the AI's opponent belief fade the way it says it does

Add tests for dom.js/saveload.js/renderShared.js + a CI typecheck gate

Tier 3: scale perf-regression guard + a CI Node-version matrix

Tier 0: fix latent defects, add determinism/perf tests and CI