docs: document the trigger skills installer (replaces agent rules)

[ericallam]

Summary

Updates the AI-tooling docs for the new trigger skills installer that shipped in #3868. The Skills page now documents trigger skills (skills bundled with the CLI, version-matched to your SDK) and the four bundled skills: authoring-tasks, realtime-and-frontend, authoring-chat-agent, chat-agent-advanced. The old Agent Rules page becomes a short "rules are now skills" redirect (kept because existing redirects and the CLI link point at it), and the Building with AI overview collapses the three-way Skills/Rules/MCP comparison into Skills vs MCP.

Hold until the v4.5 CLI release ships, since trigger skills is not on npm until then.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Configuration used: Repository UI

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Run ID: 12abbbac-5aaf-4978-8529-81ea55184c73

📥 Commits

Reviewing files that changed from the base of the PR and between 7b931f1 and 35b89ac.

📒 Files selected for processing (3)

• docs/building-with-ai.mdx
• docs/mcp-agent-rules.mdx
• docs/skills.mdx

✅ Files skipped from review due to trivial changes (3)

• docs/mcp-agent-rules.mdx
• docs/building-with-ai.mdx
• docs/skills.mdx

📜 Recent review details

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)

• GitHub Check: Analyze (javascript-typescript)

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Walkthrough

This PR rewrites and aligns documentation to introduce Trigger.dev agent skills installed via the bundled CLI command npx trigger.dev@latest skills. The skills.mdx page is restructured (concept, install flow, non-interactive flags, catalog, supported assistants, and update behavior). building-with-ai.mdx and mcp-agent-rules.mdx are updated to reference the new skills workflow and adjusted next-step cards; mcp-agent-rules.mdx is condensed to explain the transition to version-matched SKILL.md skill directories.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is incomplete. It lacks required sections from the template: the 'Closes #' reference, the checklist items, Testing section details, and Screenshots section.	Add the missing template sections: reference the related issue(s), complete the checklist, provide specific testing steps taken, and include screenshots if applicable.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: documenting the new trigger skills installer as a replacement for agent rules, which aligns perfectly with the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/trigger-skills-command

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[changeset-bot]

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Latest commit: 35b89ac

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commit: 7b931f1

[devin-ai-integration]

Devin Review found 1 new potential issue.