feat: Add built-in skill for goose documentation reference

[lifeizhou-ap]

Summary

Create a built-in skill to discover docs for user when they using goose feature. For example, help user to create a recipe with accurate recipe schema, understand how goose feature works, ....

Changes

• Create a step before documentation project build step to publish a goose-doc-map.md file. The file can be accessed publicly and contains the links and headings of the documentation pages for "Get Started" and "Guides" of Goose codename site.

• Created a built-in skill that instruct the agent to find the relevant documentation page starting from goose-doc-map.md page to help user perform tasks

TODO

• Use subagent and maybe local cache to avoid using many tokens. I tested with these change, it seems it uses quite a few tokens which indicates the content even for one page is very big
• Update the url in the skill file. Since it is not published, I used my local doc site for testing
• Maybe add some test to make sure script that generates goose-doc-map.md file is correct

Type of Change

• Feature
• Bug fix
• Refactor / Code quality
• Performance improvement
• Documentation
• Tests
• Security fix
• Build / Release
• Other (specify below)

AI Assistance

• This PR was created or reviewed with AI assistance

Testing

Related Issues

Relates to #ISSUE_ID
Discussion: LINK (if any)

Screenshots/Demos (for UX changes)

Before:

After:

[github-actions]

PR Preview Action v1.6.3
🚀 View preview at https://block.github.io/goose/pr-preview/pr-6534/
Built to branch gh-pages at 2026-01-16 08:13 UTC. Preview will be ready when the GitHub Pages deployment is complete.