[purp]

Summary

Adds a lightweight contributor skill, getting-started-with-openshell. It makes the answer to "How do I get started?" fork, open your agent, and run /getting-started-with-openshell. The skill asks about the person's interest and walks them through hands-on use. It points them toward the community and first issues only after they show real engagement.

Related Issue

Closes #5284

Changes

• New .agents/skills/getting-started-with-openshell/SKILL.md (metadata.internal: true). It runs in four phases: learn the person's interest, build and learn, assess engagement, and point toward involvement. The phase 1 questions decide what the person learns first; they are not a screen.
• Involvement starts with CNCF Slack (invite at https://slack.cncf.io) and the community call, which people join through the OpenShell Community Google Group. It does not start with Discussions.
• Once someone shows real engagement, the skill can help draft a vouch request. The draft uses only the person's own answers and what they did hands-on. They rewrite it in their own voice and post it themselves.
• Suggested first PR, called a contributor's badge: a good first issue implemented by an agent running inside an OpenShell sandbox, with OCSF log excerpts from that session as evidence.
• The skill takes no GitHub write actions.
• CONTRIBUTING.md:
  • First-Time Contributors points newcomers to the skill.
  • The contributor skills table lists the skill.
  • Both mentions of CNCF Slack now link to the inviter.
  • Vouch rule change: step 3 changes from "AI-generated vouch requests will be denied" to "based on your own use of OpenShell; an agent may help you organize it, but generic requests or ones that don't reflect your experience will be denied."

Open questions for reviewers

• Is the vouch-rule wording in CONTRIBUTING.md the policy we want?
• The skill tells people to look for good first issue work, but none is open today. Having triage-issue recommend that label is a follow-up and is out of scope for feat(skills): add a getting-started-with-openshell skill for prospective contributors #5284.

Testing

• mise run markdown:lint passes (.agents/ is excluded from markdownlint)
• Relative links and anchors in the skill resolve. The published docs, Slack inviter, Google Group, and Discussions URLs return 200.
• Unit tests added/updated (not applicable)
• E2E tests added/updated (not applicable)

Checklist

• Follows Conventional Commits
• Commits are signed off (DCO)

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