add OSPO agentic workflow examples

[aaronpowell]

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• My contribution adds a new instruction, prompt, agent, skill, or workflow file in the correct directory.
• The file follows the required naming convention.
• The content is clearly structured and follows the example format.
• I have tested my instructions, prompt, agent, skill, or workflow with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.

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Description

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Type of Contribution

• New instruction file.
• New prompt file.
• New agent file.
• New plugin.
• New skill file.
• New agentic workflow.
• Update to existing instruction, prompt, agent, plugin, skill, or workflow.
• Other (please specify):

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Additional Notes

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By submitting this pull request, I confirm that my contribution abides by the Code of Conduct and will be licensed under the MIT License.

[github-actions]

⚠️ This PR targets main, but PRs should target staged.

The main branch is auto-published from staged and should not receive direct PRs.
Please close this PR and re-open it against the staged branch.

You can change the base branch using the Edit button at the top of this PR,
or run: gh pr edit 819 --base staged

[Copilot]

Pull request overview

Adds several OSPO-focused agentic workflow examples to the repository’s workflows/ collection, and registers them in the workflows documentation list.

Changes:

• Added OSPO workflows for stale repo reporting, org health reporting, contributor reporting, and OSS release compliance checking.
• Updated docs/README.workflows.md to include the new workflows in the table.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
workflows/ospo-stale-repos.md	New workflow definition for identifying stale repos and generating an archival recommendation report.
workflows/ospo-release-compliance-checker.md	New workflow definition for analyzing OSS release readiness and posting a compliance report comment.
workflows/ospo-org-health.md	New workflow definition for generating an org-wide weekly health report with operational metrics.
workflows/ospo-contributors-report.md	New workflow definition for generating monthly contributor activity metrics.
docs/README.workflows.md	Adds the new workflows to the documented workflows table.