expose previewFeatures flag in a2a

[sehoon38]

Summary

Expose previewFeatures flag in a2a to allow code assist agent mode to access gemini 3.

Details

Without previewFeatures flag, a2a won't be able to trigger gemini 3 model.

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:
  • [x] MacOS
    • [x] npm run
    • [ ] npx
    • [ ] Docker
    • [ ] Podman
    • [ ] Seatbelt
  • [ ] Windows
    • [ ] npm run
    • [ ] npx
    • [ ] Docker
  • [ ] Linux
    • [ ] npm run
    • [ ] npx
    • [ ] Docker

[gemini-code-assist[bot]]

Summary of Changes

Hello @sehoon38, I'm Gemini Code Assist[^1]! 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 integrates a previewFeatures flag into the a2a server's configuration, allowing the system to leverage advanced capabilities, specifically the Gemini 3 model. This is a foundational step to enable and test new model functionalities within the agent-to-agent communication framework.

Highlights

• Feature Flag Exposure: The previewFeatures flag has been exposed within the a2a (agent-to-agent) server configuration.
• Gemini 3 Model Access: This change enables the code assist agent mode to access the Gemini 3 model, which was previously inaccessible without the previewFeatures flag.

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[github-actions[bot]]

Size Change: -2 B (0%)

Total Size: 21.5 MB

ℹ️ View Unchanged

Filename	Size	Change
./bundle/gemini.js	21.5 MB	-2 B (0%)
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB	0 B
./bundle/sandbox-macos-permissive-open.sb	890 B	0 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB	0 B
./bundle/sandbox-macos-restrictive-closed.sb	3.29 kB	0 B
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB	0 B
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB	0 B

_{compressed-size-action}

[sehoon38]

/gemini review