docs(cli): mention per-model token usage in stream-json result event

[yongruilin]

Summary

Updates the docs/cli/headless.md to reflect that the stream-json result event now includes per-model token usage breakdowns alongside aggregated statistics.

Details

• Updated the result event description in the Streaming JSON output section to mention per-model token usage breakdowns, matching the change introduced in feat(core): add per-model token usage to stream-json output #21839.

Related Issues

Related to #21839

How to Validate

1. Review the change in docs/cli/headless.md and confirm the result event description accurately reflects the current StreamStats schema.

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 focuses on enhancing the accuracy of the command-line interface documentation. It updates the description of the stream-json result event to clearly state that it now provides detailed per-model token usage breakdowns, alongside the previously available aggregated statistics. This ensures that users have up-to-date information regarding the output structure and available data, improving clarity and alignment with the actual software behavior.

Highlights

• Documentation Update: Updated the docs/cli/headless.md file to reflect changes in the stream-json result event output.
• Token Usage Details: The documentation now explicitly mentions that the result event includes per-model token usage breakdowns, in addition to aggregated statistics.
• Feature Alignment: This update aligns the documentation with the changes introduced in related pull request feat(core): add per-model token usage to stream-json output #21839.

Changelog

• docs/cli/headless.md
  • Updated the description for the result event in the Streaming JSON output section to explicitly mention per-model token usage breakdowns.

Activity

• The pull request was created by yongruilin.
• No human activity (comments, reviews, etc.) has occurred yet.

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[gemini-code-assist]

Code Review

This pull request updates the documentation in docs/cli/headless.md to reflect a recent change in the stream-json output format. The description for the result event is updated to mention that it now includes per-model token usage breakdowns. I have reviewed the change and have no feedback.

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

[jkcinouye]

LGTM!