[skill-update] github-agentic-workflows-skill-update: add interactive workshop resource

[github-actions]

Summary

The GH-AW home page (https://github.github.com/gh-aw/) now prominently features an Interactive Workshop (marked "New") as a first-class learning resource for GitHub Agentic Workflows.

The existing references/authoring.md covers agent-assisted setup prompts and the debug prompt but had no entry for the workshop. This PR adds it to the Agentic Authoring Support section.

Material Delta

skills/github-agentic-workflows/references/authoring.md

• Added item 4 in the Agentic Authoring Support section:

  Use the interactive workshop at https://github.github.com/gh-aw/workshop/ for hands-on exercises that cover installation, authoring, and running agentic workflows end to end.

• Source: https://github.github.com/gh-aw/#workshop — the "Workshop" section of the GH-AW home page, where this resource is listed as New.

Validation

• Metadata validator: PASS (validate-metadata.py exits 0)
• All other skill files are unchanged; the source page confirms no other frontmatter fields, commands, or security guidance has changed materially from what the skill already captures.

No-action rationale for other areas

Area	Finding
MCP servers	Already in authoring.md line 59 (mcp: field)
OpenTelemetry	Already in security-and-operations.md
Gemini engine	Already in security-and-operations.md authentication table
Web interface creation path	Already in authoring.md "Creation Paths"
Safe outputs (noop, dispatch-workflow, create-agent-session)	Already in security-and-operations.md
All 6 security guardrail layers	Already in security-and-operations.md

Risks

• The workshop URL is inferred from the home page link text ("Browse the original gh-aw-workshop repository"). If the canonical workshop URL differs, the link should be updated once confirmed.

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