build: remove legacy bespoke CI and deployment scripts

[HeyItsGilbert]

Removes the old Azure Pipelines / GitHub Actions build pipeline now superseded by psake + PowerShellBuild (#493).

• .github/workflows/github.yml
• azure-pipelines.yml and templates/
• Build/*.ps1
• Deploy/* (PSDeploy scripts, only caller was the removed workflow)
• README.md: drop dead Azure Pipelines badges and download link

Closes #486

Stack: 1/3 -> #496 -> #497

[Copilot]

🔵 Needs a closer look

Tag-based publishing is removed without an equivalent path, and the README clone instructions need a working module bootstrap/build path.

Pull request overview

Removes legacy Azure/GitHub CI and bespoke build/deployment scripts in favor of the psake + PowerShellBuild workflow.

Changes:

• Deletes legacy CI pipelines and templates.
• Removes obsolete build, testing, changelog, and deployment scripts.
• Cleans outdated README references.

File summaries

File	Description
templates/test-steps.yml	Removes legacy test steps.
templates/register-local-repo.yml	Removes repository registration template.
templates/install-built-module.yml	Removes artifact installation template.
templates/environment-setup.yml	Removes environment setup template.
README.md	Removes obsolete badges and download links.
Deploy/Publish.ps1	Removes publishing wrapper.
Deploy/PSGallery/PSKoans.psdeploy.ps1	Removes PSGallery deployment definition.
Deploy/FileSystem/PSKoans.psdeploy.ps1	Removes filesystem deployment definition.
Build/Register-FileSystemRepository.ps1	Removes repository helper.
Build/New-Changelog.ps1	Removes changelog generator.
Build/Invoke-ModuleTests.ps1	Removes legacy test runner.
Build/Initialize-Environment.ps1	Removes environment initialization.
Build/Build-Module.ps1	Removes legacy module build script.
azure-pipelines.yml	Removes Azure Pipelines configuration.
.github/workflows/github.yml	Removes the superseded GitHub Actions workflow.

Review details

Suppressed comments (3)

.github/workflows/github.yml:1

• This deletion also removes the tag-based publish job that deployed to PSGallery and created GitHub release assets from the nupkg and changelog. The replacement stacked workflow only runs CI, so the repository will silently stop publishing releases on tags unless an equivalent release workflow is added or this behavior is explicitly retired.
  README.md:58
• The clone instructions now leave users importing the source tree directly, but PSKoans/PSKoans.psd1 requires the generated PSKoans.format.ps1xml, which is absent from a fresh checkout because *.format.ps1xml is ignored. Following these steps therefore fails before Show-Karma can run; update this path to bootstrap/build the module (or generate the format file) and use the resulting module location.

1. `git clone` the repository into your desired directory.

azure-pipelines.yml:1

• Deleting this workflow also removes the tag-triggered PublishModule and PublishAssets jobs that published to PSGallery and attached the .nupkg/changelog to GitHub releases. The replacement stacked workflow only runs CI and does not invoke the new Publish task, so tags will no longer produce releases unless this automation is intentionally being retired; please retain or add an equivalent publish path before merging.

• Files reviewed: 15/15 changed files
• Comments generated: 0
• Review effort level: Lite

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