[Feature]: Remember executor settings

[ai-made-approachable]

Feature Request

There are certain nodes that only work with the "node" executor. Sadly Rivet application does not remember this setting, so you have to set it each time you open the project. This setting should be saved in the .rivet-project file

Code of Conduct

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[codemile]

[abrenneke]

There's a "Default Executor" in the settings that's remembered, but saving with the project would make sense