feat(utilities): forward render context options through createGame

[stormmuller]

Summary

createGame built its render context with createRenderContext(canvas) and took no options. A game set up with createGame therefore always rendered at the display's full devicePixelRatio and couldn't set maxPixelRatio. On a 2× display, that means every full-screen pass covers 4× the pixels.

This PR adds an optional second argument to createGame, typed as the new exported CreateGameOptions. Its renderContext field is forwarded unchanged to createRenderContext:

const { renderContext } = createGame('game', {
  renderContext: { maxPixelRatio: 1.5 },
});

Existing calls with one argument behave exactly as before; the render context gets {}, so all defaults are kept. Defaults follow the repo's default…Options convention.

• src/utilities/create-game.ts: new CreateGameOptions interface and options parameter, forwarded to createRenderContext
• src/utilities/create-game.test.ts: tests for the default (no options) and the forwarded options
• Docs: ecs/game.md shows the new argument, and the high-DPI section of rendering/world-units-and-cameras.md shows how to cap the pixel ratio through createGame
• CHANGELOG.md: an Added entry under [Unreleased]

Related issue(s)

Fixes defect report 009: "createGame can't pass RenderContextOptions, so a game can't cap its render resolution".

Verification checklist

• npm run check-types passes with 0 errors
• npm test passes (226 files, 1733 tests)
• npm run lint passes with 0 errors (2 existing TODO warnings in material.ts)
• npm run cspell passes with 0 errors
• npm run check-exports passes
• Any new/changed public API is exported from the module's index.ts (CreateGameOptions is exported via the existing export * from './create-game.js')
• Documentation under /documentation-site/docs/docs is updated
• Demos that use createGame: no code changes needed, since the change is backward compatible. Ran npm run build, then the docs-site typecheck and build, and loaded the particles, ecs and text demos in Chromium. All three rendered. The only console errors were external resources that the sandbox's proxy blocked.

Changelog

• A bullet has been added under ## [Unreleased] in CHANGELOG.md

🤖 Generated with Claude Code

https://claude.ai/code/session_012jXdrrhDQTunF1wimhhC5t

---

Generated by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!