CI flake: Godot `dotnet build` exited 139 building Blackholio

[clockwork-labs-bot]

Detected from GitHub Actions failure reported in #ci-gremlin.

Run:

• Workflow: CI
• Event: merge_group
• Branch: gh-readonly-queue/master/pr-5164-7a2a697ee459a4e1efd905e9adf8f9fa9f7dcf1f
• Head SHA: d0c6647a7e8598257db4d0ea8a0c5cf40ae5f8d2
• Run: https://github.com/clockworklabs/SpacetimeDB/actions/runs/27017032979
• Failed job: https://github.com/clockworklabs/SpacetimeDB/actions/runs/27017032979/job/79735313026 (godot-testsuite)

Failure:

• Step: Build Godot project
• The job failed before Start SpacetimeDB, Publish godot-tests module to SpacetimeDB, or Run Godot tests could run.
• Godot invoked:

/usr/share/dotnet/dotnet build /home/runner/actions-runner/_work/SpacetimeDB/SpacetimeDB/demo/Blackholio/client-godot/blackholio.csproj -c Debug -v normal -l:GodotTools.BuildLogger.GodotBuildLogger,/home/runner/.local/share/godot/mono/build_logs/8003971bbe52b6f3bd1311a35fb67478_Debug -p:GodotTargetPlatform=linuxbsd

Relevant log excerpt:

MSBuild exited with code: 139. Log file: /home/runner/.local/share/godot/mono/build_logs/8003971bbe52b6f3bd1311a35fb67478_Debug/msbuild_log.txt
ERROR: An EditorPlugin build callback failed.
   at: call_build (editor/editor_node.cpp:7500)
ERROR: Command line option --build-solutions was passed, but the build callback failed. Aborting.
   at: iteration (main/main.cpp:5064)

Notes:

• Runner: ghr-github-overflow-07-spacetimedb-14900k-runner-1530-caf18c7e
• This looks like a Godot/.NET build crash rather than a product test assertion failure.