Member Junction
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    WriteOp:
        | { Dest: string; Kind: "copy"; SourceAbs: string }
        | { Dest: string; Kind: "content"; Text: string }
        | { Dest: string; Kind: "emptyDir" }

    A single entry to materialize in the distribution, relative to the distribution root. emptyDir represents a directory that must exist even when it has no files (e.g. the CodeGen output folder) — stored as a directory entry in a zip, mkdir on disk.