fix: forward go runner exit status

[not-matthias]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes the exit status forwarding in the Go runner wrapper script to ensure that the exit codes from both the Go test runner and standard Go binary are properly propagated to the calling process.

• Adds explicit exit $? statements after command execution
• Ensures proper exit status forwarding for both test and non-test Go commands

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