Add WebGPU/WebAssembly build infrastructure and documentation#2

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Copilot wants to merge 7 commits intomainfrom

copilot/reimplement-webgpu-webasm-support

Commits on Dec 3, 2025

Initial plan
Copilot
committed
Add WebGPU/WebASM build infrastructure and documentation

Copilot
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benpm
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Add environment check script, quickstart guide, and migration roadmap

Copilot
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benpm
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Address code review feedback: fix emscripten.cmake, improve portability and responsiveness

Copilot
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benpm
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Improve code quality: add comments, fix escaping, clarify logic

Copilot
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benpm
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Add explicit permissions to GitHub Actions workflows for security

Copilot
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benpm
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Add comprehensive PR summary document

Copilot
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benpm
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