feat: add Azure Pipelines integration for setup-vp

[tonoizer]

Summary

• Add a reusable Azure Pipelines step template (azure/setup-vp.yml) with Bash and PowerShell bootstraps for Linux/macOS and Windows agents.
• Extract shared dependency-light CI primitives into src/ci/* and keep the GitLab runtime as thin adapters over that layer.
• Add an Azure runtime (src/azure/*, dist/azure/index.mjs) with prepare / finalize phases around Azure Cache@2, including cross-platform SFW support and logging-command adapters.
• Document the integration in rfcs/azure-pipelines-integration.md and extend README/AGENTS/CI smoke coverage.

Test plan

• vp run typecheck
• vp run test (306 tests)
• vp run check
• vp run build
• bash -n azure/bootstrap.sh gitlab/bootstrap.sh
• PowerShell syntax check for azure/bootstrap.ps1
• Portable bundle smoke test (dist/azure/index.mjs invalid-phase failure)
• GitHub Action bundle unchanged (dist/index.mjs)
• Real Azure Pipelines validation on ubuntu-latest, macOS-latest, and windows-latest (release-blocking follow-up)

Notes

• plans/ was intentionally excluded from this PR.
• Azure end-to-end cache and cross-OS validation still needs an Azure DevOps project with a GitHub service connection before release.

[naokihaba]

@codex review

[chatgpt-codex-connector]

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[naokihaba]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 9f5b303fd1

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[tonoizer]

@naokihaba what else do we need to get this PR merged/CI run for full validation?

[naokihaba]

@fengmk2

I have finished reviewing your code.
Before we can merge it, we just need to make sure it passes two checks.

First, we need to run it on an actual Azure DevOps project.
Second, we need to run it in the GitLab CI environment to confirm the refactoring hasn't broken anything or caused any regressions.

Do we happen to have an Azure DevOps project set up in our company that we could use?

[naokihaba]

@tonoizer

I've reviewed the latest changes and everything looks good, so I'm happy to approve them.

As for the next steps, the maintainers first need to approve the GitHub Actions workflows for this fork. It looks like the test workflows are currently paused because they're waiting for approval.
URL: https://github.com/voidzero-dev/setup-vp/actions/runs/29161983427

Once all the standard CI checks pass, we'll move on to running integration tests on Ubuntu, macOS, and Windows using the actual Azure DevOps project.

At the same time, I'd like to run some smoke tests in GitLab CI just to make sure the refactoring of the common CI hasn't caused any regressions or other issues.

Once all these checks are complete and we've cleared any other reviews or merge criteria, we should be all set to merge.

[tonoizer]

@naokihaba Alright sounds good thanks a lot. I would love to help with Azure validation but I am not allowed to give access to our Azure stuff, but still happy to help.