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Add checkPackageMain(), which uses go/parser with PackageClauseOnly mode
(reads only the package-declaration token of each .go file — very fast)
to verify the resolved binary directory declares `package main`.
Called in groupByModule for every argument after resolving the absolute
path, before findModuleRoot. Produces a helpful error, e.g.:
monorel: error: .../io/transform/gsheet2csv is package "gsheet2csv",
not a main package