Add GitHub Actions release workflow to build and publish Windows binaries

[enijburg]

Motivation

• Provide an automated release pipeline to build Windows x86_64 binaries on tag pushes and to exercise the release build on pull requests to main.

Description

• Add new workflow file ./github/workflows/release.yml to trigger on tag pushes matching v* and on PRs to main.
• Validate semantic version tags with a shell check, install the Rust toolchain via dtolnay/rust-toolchain@stable, and target x86_64-pc-windows-msvc for release builds.
• Cache Cargo registry, index, and target build directory, run cargo build --release --target <target>, package the produced binary into a ZIP using PowerShell, upload artifacts with actions/upload-artifact@v4, and create a GitHub Release using softprops/action-gh-release@v2.

Testing

• No automated tests were executed as part of this PR; the new workflow will run on tag pushes and PRs once merged or when tags are pushed to the repository.

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Codex Task