test: add ECS EntityId + utility unit tests, test runner, and CI

[braedonsaunders]

Motivation

• Improve unit test coverage for core engine utilities (EntityId allocator, FixedPoint, MerkleTree, GameLoop) to catch regressions in allocation, determinism, and timing behavior.
• Provide a hermetic test build/run flow and CI so tests run consistently in CI and locally.

Description

• Add unit tests under tests/ for EntityId (tests/engine/ecs/entityId.test.ts), GameLoop (tests/engine/core/gameLoop.test.ts), MerkleTree (tests/engine/network/merkleTree.test.ts), and FixedPoint utilities (tests/utils/fixedPoint.test.ts).
• Add test tooling and aliases: scripts/test-alias.cjs to resolve @/ imports to compiled test output and tsconfig.test.json to compile tests to dist-tests.
• Wire up test runner via package.json test script and add CI workflow at .github/workflows/ci.yml to run lint, type-check, test, and build; update .gitignore and README.md to include test artifacts and instructions.

Testing

• Ran npm run test, which compiles tests and executes them; all automated tests passed (# tests 18, # pass 18, # fail 0).
• Test suites executed include GameLoop fallback timing, EntityId utilities / EntityIdAllocator, MerkleTree utilities, and FixedPoint utilities, and they completed successfully.
• The test harness and alias resolver (scripts/test-alias.cjs) were exercised during the run and functioned as expected.

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Codex Task

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Project	Deployment	Review	Updated (UTC)
voidstrike	Ready	Preview, Comment	Jan 25, 2026 4:48am