Add Claude Code Plugin setup page

[samgutentag]

Summary

• Adds a new docs page for the Claude Code Plugin setup alongside the existing MCP server (CLI) setup page
• Covers plugin install via the community plugins directory, OAuth authentication, slash commands (fix-flaky, why-flaky, setup-uploads), and auto-activating skills
• Manual GitHub URL install included as a fallback behind a details dropdown
• Wires the page into summary.md navigation and the configuration card grid

Test plan

• Verify /plugin install trunk@claude-plugin-directory resolves from the community directory
• Verify /plugin install trunk@https://github.com/trunk-io/claude-code-plugin works as fallback
• Verify GitBook preview renders the new page correctly (including details dropdown)
• Confirm the card grid on the Configuration page links to the new page
• Confirm navigation sidebar shows "Claude Code Plugin" after "Claude Code (CLI)"
• Review content accuracy against the plugin repo

Generated with Claude Code

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[claude]

Claude finished @samgutentag's task in 1m 18s —— View job

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PR Review

• Gather context and read changed files
• Review for typos, grammar, and formatting
• Review documentation best practices
• Post inline comments for specific issues
• Summarize findings

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Summary

The new claude-code-plugin.md page is well-structured and the navigation wiring (summary.md, README.md) looks correct. However, there is one blocking issue and a few minor style nits.

Blocking

• Line 12 — The primary install command /plugin install trunk@claude-plugin-directory is broken until the plugin lands in the official Anthropic directory (explicitly called out as a blocker in the PR description). The page should either lead with the working direct-URL install (/plugin install trunk@https://github.com/trunk-io/claude-code-plugin) or add a clear caveat, before this page ships.

Non-blocking

• Line 17 — "run /plugin from Claude Code" is vague; the exact command isn't spelled out.
• Line 42 — "Say yes" is informal; "Confirm to apply" is more consistent with the rest of the doc's tone.
• Line 58 — "copy-pasteable" is informal; "ready-to-paste" reads better in docs.

Inline suggestions posted for all four items above.

[claude]

Claude finished @samgutentag's task in 1m 19s —— View job

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PR Review

• Gather context and read changed files
• Review for typos, grammar, and formatting
• Review documentation best practices
• Post inline comments for specific issues
• Summarize findings

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Summary

The structure, navigation wiring (summary.md, README.md), and overall content of claude-code-plugin.md are solid. The previous feedback on "copy-pasteable" and the vague auth instruction have been addressed. Three issues remain:

Blocking

• Line 14 — The primary install command /plugin install trunk@claude-plugin-directory still won't resolve until the plugin is listed in the official Anthropic directory — the stated reason this PR is on hold. The <details> alternative (GitHub URL) is the only working install path right now. Consider swapping them: lead with the direct-URL install, and put the directory install in <details> as "once approved". Fix this →

Non-blocking

• Line 17 — The link points to anthropics/claude-plugins-community but the PR description references anthropics/claude-plugins-official as the relevant directory. Please verify which repo is correct and align the link.
• Line 56 — "Say yes" remains informal compared to the rest of the doc's tone; suggest "Confirm to apply the changes directly."