Add new agent skills to Claude marketplace

[ethanpalm]

Documentation changes

This PR adds three new skills and puts them on the marketplace.

• doc-reader: skill for efficiently processing documentation. Favors loading llms.txt and connecting to MCP servers
• doc-helper: skill for collaboratively writing docs with final decisions made by the user
• doc-author: skill for autonomously updating docs with guardrails

Closes

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
• Links resolve to the right destinations
• Prerequisites and requirements are accurate

✅ Clarity and completeness

• Instructions are clear and easy to follow
• Steps are in logical order
• Nothing important is missing
• Examples help illustrate the concepts

✅ User experience

• A new user could follow these docs successfully
• Common gotchas or edge cases are addressed
• Error messages or troubleshooting guidance is helpful

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Note

Introduces three documentation-focused skills and updates the Claude marketplace manifest to publish them.

• Adds SKILL.md specs for doc-reader, doc-helper, and doc-author under ./.claude/skills/* with conventions, workflows, and examples
• Updates ./.claude-plugin/marketplace.json: bumps metadata to version: 1.1.0, adds plugins for the three new skills (with skills paths and MCP server config), and refines doc-reviewer description
• Scope is docs/config only; no runtime code changes

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[mrmps]

looks good to me