Add GitHub Actions CI to run CMake build on Linux and Windows

[gycog]

Motivation

• Ensure the repository builds on both Linux and Windows for PRs and pushes to dev and main to catch build regressions early.

Description

• Add .github/workflows/ci.yml which triggers on push, pull_request, and workflow_dispatch, sets contents: read permissions, and defines a matrix job for ubuntu-latest and windows-latest that checks out the repo with actions/checkout@v4 and runs CMake configure and build steps using cmake -S . -B build -DCMAKE_BUILD_TYPE=Release and cmake --build build --config Release, with Windows using PowerShell and the -G "NMake Makefiles" generator.

Testing

• No automated tests were executed as part of this change; the new CI workflow will run the CMake configure and build steps on GitHub Actions for both Ubuntu and Windows when triggered.

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Initialize MSVC env before selecting NMake generator

The Windows configure step hard-codes -G "NMake Makefiles" but does not set up a Visual Studio developer environment first, so on windows-latest this can fail during configure when nmake/cl are not initialized in the shell. CMake’s generator docs note that command-line generators (including NMake) must be run from a prompt already configured for the chosen compiler/build tool, so this workflow can make the Windows matrix leg fail even when the project itself is healthy.

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