This pull request introduces automated packaging and publishing support for WinGet, updates documentation to reflect the finalized WinGet package identifier, and improves instructions for Windows users. The most important changes are summarized below.

WinGet packaging and publishing automation:

• Added a new GitHub Actions workflow (.github/workflows/winget-package-publish.yml) to build, test, and publish a portable Windows executable (devspec.exe) for WinGet, including artifact uploads and release attachments.

Documentation updates for WinGet:

• Updated all references in documentation and the WinGet manifest to use the finalized package identifier SpecLabs.Devspec instead of the placeholder.
• Added instructions in docs/how-to/README.md for validating and submitting the generated WinGet manifest, and clarified the workflow naming conventions for package providers.

WinGet manifest improvements:

• Updated packaging/winget/devspec.yaml with the correct PackageIdentifier, Publisher, and InstallerUrl for the public release.