docs: update subagent configuration schema table

[mwilliams31]

Summary

Adds the display_name field to the subagent configuration schema and corrects the mcp_servers field name.

Details

Incorporated based on localAgentSchema definition in agentLoader.ts.

Related Issues

Fixes #26984.

How to Validate

1. Review the updated documentation for the subagent configuration.
2. Ensure both the display_name and mcp_servers fields are included and correctly formatted in the configuration.
3. Test the UI to confirm the display name appears as expected and that MCP servers function as intended.

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed)
• Noted breaking changes (if any)
• Validated on required platforms/methods:
  • MacOS
    • npm run
    • npx
    • Docker
    • Podman
    • Seatbelt
  • Windows
    • npm run
    • npx
    • Docker
  • Linux
    • npm run
    • npx
    • Docker

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the subagent configuration documentation to better align with the codebase. It introduces a new display_name field for improved UI presentation and corrects the naming convention of the mcp_servers field to match the actual implementation.

Highlights

• Schema Update: Added the display_name field to the subagent configuration schema to support human-readable naming in user interfaces.
• Field Correction: Renamed the mcpServers field to mcp_servers in the documentation to ensure consistency with the implementation.

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[gemini-code-assist]

Code Review

This pull request updates the subagent documentation by adding a display_name field and renaming mcpServers to mcp_servers. A review comment identifies that the rename is incomplete, as other references in the document still use the camelCase format, and recommends updating all instances for consistency.

_{Note: Security Review has been skipped due to the limited scope of the PR.}