Summary

Extend the release workflow to automatically submit PRs to microsoft/winget-pkgs, plus add validation and manual retry workflows.

Changes

• Add winget job to .github/workflows/release.yml
• Create .github/workflows/winget-publish.yml for manual publishing
• Create .github/workflows/test-winget.yml for manifest validation on PRs
• Document WINGET_GITHUB_TOKEN secret requirement

Workflow logic

1. Wait for goreleaser job to complete
2. Download wingetcreate tool
3. Check if manifest already exists in microsoft/winget-pkgs
4. If exists: use wingetcreate update command
5. If new: process templates and use wingetcreate submit
6. Use .NET regex for sequential checksum replacement (PowerShell -replace doesn't support count parameter)

Files to modify/create

• .github/workflows/release.yml (add winget job)
• .github/workflows/winget-publish.yml (new)
• .github/workflows/test-winget.yml (new)

Required secrets

Acceptance criteria

• Release workflow includes Winget publishing job
• Test workflow validates manifests on PRs touching packaging/winget/**
• Manual workflow allows re-publishing specific versions
• PR successfully created on microsoft/winget-pkgs

Dependencies

• Depends on feat(build): Add Windows amd64 and arm64 builds to GoReleaser #35 (Windows builds)
• Depends on feat(packaging): Add Winget manifest templates #38 (Winget manifest templates)