[docs] Update documentation for plugins and payload-dir features

[github-actions]

Documentation Updates - February 6, 2026

This PR updates the frontmatter reference documentation based on features merged in the last 24 hours.

Features Documented

1. Plugin Installation Support (from #14041)

• Added plugins: frontmatter field documentation
• Documented both array format (simple) and object format (with custom token)
• Explained cascading GitHub token resolution for plugin installation
• Clarified plugin repository format requirements (org/repo)

2. Payload Directory Configuration (from #14026)

• Added payload-dir: frontmatter field documentation
• Explained the purpose of the payload directory for large MCP responses
• Documented default path and mount permissions (read-only for agent, read-write for gateway)
• Clarified automatic configuration when using MCP servers

Changes Made

• Updated docs/src/content/docs/reference/frontmatter.md:
  • Added plugins: section after github-token: with usage examples
  • Added payload-dir: section after plugins: with configuration details
  • Maintained consistent documentation style and structure

Merged PRs Referenced

• Add plugin installation support via frontmatter with dual-format configuration and cascading token resolution #14041 - Add plugin installation support via frontmatter with dual-format configuration and cascading token resolution
• Configure payloadDir for MCP gateway to enable large payload sharing #14026 - Configure payloadDir for MCP gateway to enable large payload sharing

Notes

Both features are production-ready and available in the latest release. The documentation follows the existing Diátaxis framework structure, providing reference-style technical descriptions with code examples.

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• expires on Feb 7, 2026, 6:09 AM UTC