test: add event bus and math coverage

[braedonsaunders]

Motivation

• Increase unit test coverage for core utilities and engine components to improve reliability and catch regressions early.
• Add deterministic, Node-friendly test infra so TypeScript tests can be compiled and executed outside the browser runtime.
• Ensure CI and local workflows run linting, type-checking, tests, and builds consistently.

Description

• Added comprehensive unit tests for core modules including EventBus, math utilities (SeededRandom, clamp, lerp, etc.), SpatialGrid, GameLoop, EntityId utilities and allocator, MerkleTree utilities, and FixedPoint utilities under tests/.
• Introduced test infra: tsconfig.test.json to compile tests into dist-tests and scripts/test-alias.cjs to remap @/ imports at runtime, and updated package.json with a test script that runs tsc -p tsconfig.test.json then runs compiled Node tests with --require ./scripts/test-alias.cjs.
• Added CI and linting support files including .eslintrc.cjs, a GitHub Actions workflow at .github/workflows/ci.yml, updated .gitignore to ignore dist-tests, and documented npm run test in README.md.

Testing

• Ran npm run test, which compiles tests with tsc -p tsconfig.test.json and executes them with node --require ./scripts/test-alias.cjs --test, and the full suite passed with 34 tests across 8 suites and 0 failures.
• Verified EventBus behaviors (subscribe/once/unsubscribe/during-emit/error reporting) and math determinism (SeededRandom) specifically via the new tests; all assertions succeeded.
• Local test run completed successfully with no failing or skipped tests using the configured test pipeline.

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Codex Task

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Project	Deployment	Review	Updated (UTC)
voidstrike	Ready	Preview, Comment	Jan 25, 2026 5:08am