[skill-update] github-agentic-workflows: add github-tools ref, official guides, and agent authoring file

[github-actions]

Summary

Refreshes the skills/github-agentic-workflows skill from the prefetched gh-aw homepage snapshot (https://github.github.com/gh-aw/), targeting three material gaps not yet covered by the existing skill files.

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Material Deltas

1. GitHub tools reference URL added to references/authoring.md

Source: https://github.github.com/gh-aw/reference/github-tools/ — visible as a feature card link on the homepage.

The existing Frontmatter Priorities section describes tools: and toolsets: but gave no pointer to the official reference for which toolsets expose which operations. Added a sentence after the frontmatter list directing agents to reference/github-tools/ when selecting a minimal toolsets: set.

2. Official github-agentic-workflows.md agent file URL added to references/authoring.md

Source: https://raw.githubusercontent.com/github/gh-aw/main/.github/aw/github-agentic-workflows.md — linked from the gh-aw homepage as the canonical authoring guidance file.

The Agentic Authoring Support section previously listed install.md, debug.md, and the workshop, but not this file. It is distinct from the others: it is the machine-readable agent instruction file for GH-AW's own authoring surface, useful when a coding agent needs the canonical form directly.

3. Official guide and example URLs added to references/examples.md

Sources:

• https://github.github.com/gh-aw/guides/ai-issue-triage/ — IssueOps guide
• https://github.github.com/gh-aw/guides/docs-automation/ — Continuous Documentation guide
• https://github.github.com/gh-aw/guides/automated-pr-review/ — Quality/PR review guide
• https://github.github.com/gh-aw/guides/ai-release-notes/ — ProjectOps/release-notes guide
• https://github.github.com/gh-aw/examples/multi-repo/ — Multi-repository coordination example

All five are directly linked from the homepage navigation/gallery. The Common Production Patterns list previously named the workflow families without pointing to the official guide or example pages. Added inline URLs for five of the nine entries.

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Validations Run

• validate-metadata.py passes (SUCCESS)
• SKILL.md remains 91 lines (well under 500-line limit)
• Checklist: naming, directory match, description, no human docs, flat hierarchy all unchanged and still pass

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Unresolved Risks

• The prefetched source is the gh-aw homepage HTML snapshot only (1 file). Secondary reference pages (reference/github-tools/, specific guide content, github-agentic-workflows.md body) were not prefetched, so the new URLs are added as navigation pointers rather than with extracted detail. If any URL changes or the content differs materially from the pointer label, the reference will be stale.
• No user-supplied prompt text for this run; all changes derive solely from the prefetched homepage source.

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