Root cause: Process inherits the XCTest runner's sandbox, preventing
the app from writing diagnostics to /tmp/. NSWorkspace.openApplication
goes through LaunchServices, which launches the app in its own process
context outside the sandbox. Using activates=false avoids the 60s
foreground activation timeout that killed the previous NSWorkspace
attempt on headless CI runners.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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