[codex] Add library integration smoke

[dsafdsaf132]

Summary

• add pinned three.js and twgl.js dev dependencies for integration testing
• add a three.js WebGLRenderer smoke that renders a triangle, circle, and rotated box with multi-pixel sampling
• add a twgl.js smoke covering programInfo, bufferInfo, uniform setters, indexed drawing, and multi-pixel sampling
• keep library integration tests out of npm test and run them only from GitHub Actions runtime smoke steps

Validation

• npm run build
• npm test
• npm run test:three
• npm run test:twgl
• git diff --check

[chatgpt-codex-connector]

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Reviewed commit: 78119b78cd

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