[SDAChess]

Summary

A manually pushed prerelease tag now starts Release Tag qualification, so maintainers can create candidates directly from the command line. Add a concise internal release skill: pick the latest qualified prerelease, review it with the maintainer, and tag that exact commit as stable; create and qualify a prerelease first when none exists.

Release Auto-Tag retains its explicit dispatch because its GITHUB_TOKEN pushes do not trigger another workflow.

Related Issue

Closes #4334

Changes

• Remove the -pre.* exclusion from Release Tag's push trigger.
• Add the internal release-openshell skill and register it in the contributor inventory.
• Align CI.md with prerelease and stable tag push triggers.

Testing

• Checks appropriate to the affected code and behavior pass: actionlint for Release Tag and Release Auto-Tag, Markdown lint for the skill and changed docs, skill validation, and git diff --check.
• Skill inventory, unique names, and internal metadata checks pass for all 23 skills.
• Local skill discovery from a disposable copy exposes only the four public skills; the new maintainer skill remains internal. Used the cached Skills CLI without installing dependencies.
• Unit and E2E tests are not applicable to this trigger and contributor-guidance change. No release workflow was dispatched during validation.
• The local commit hook was bypassed with maintainer approval after failing because mise was absent from PATH; the focused checks above ran separately.

Checklist

• Follows Conventional Commits
• Commits are signed off (DCO)
• Architecture docs: not applicable.

[github-actions]

🌿 Preview your docs: https://nvidia-preview-pr-4335.docs.buildwithfern.com/openshell

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[SDAChess]

/ok-to-test 2a208bc