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R language support results in KeyError: 'language' when opening an R project

R language support results in KeyError: 'language' when opening an R project: a task in LegoFlow-SWE (Harbor dataset). When Serena is pointed at an R project directory, any attempt to use the language intelligence features (symbol search, go-to-definition, etc.) fails immediately with a KeyError…

The task

When Serena is pointed at an R project directory, any attempt to use the language intelligence features (symbol search, go-to-definition, etc.) fails immediately with a `KeyError: 'language'`. This makes Serena unusable for R developers.

Part of Lego-X/LegoFlow-SWE.