[Bug]: Built-in Antigravity installation fails to start on Linux ARM64 (aarch64)

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/server

Steps to reproduce

1. Run T3 Code on a Linux ARM64 (aarch64) server.
2. Open Settings → Providers → Antigravity.
3. Do not configure a custom Antigravity executable path.
4. Use T3 Code's built-in "Install Antigravity" option.
5. Wait for T3 Code to download the Antigravity runtime.
6. Observe the provider status after the download/install attempt.

Expected behavior

T3 Code should download and install the appropriate Antigravity runtime for Linux ARM64 (aarch64).

After installation, the runtime should start successfully and the Antigravity provider should become available.

Actual behavior

The built-in installation downloads the Antigravity runtime, but the runtime fails to start.

The UI shows:

"657 MB download."

followed by:

"The downloaded Antigravity runtime could not start in this environment."

The Antigravity provider then remains in the "Not found" state with:

"Antigravity is not installed. Install it in this environment or set a custom executable path."

A "Retry installation" button is shown.

Impact

Blocks work completely

Version or commit

v0.0.42

Environment

OS: Linux ARM64 / aarch64

Logs or stack traces

Screenshots, recordings, or supporting files

screenshot (32).png

Workaround

No work arround found

Start in apps/server and reproduce the built-in Antigravity installation on a Linux ARM64 environment, checking why the downloaded runtime fails to start. Done means the appropriate ARM64 runtime installs successfully, starts, and makes the Antigravity provider available instead of showing Not found.