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Saves an OutputArtifact to a file with text content.

Copies a FileReferenceOutputArtifact to the output location. If the source is a directory, it is copied recursively.

When FileReferenceOutputArtifact.useChecksumInvalidation is enabled, a sibling .checksum file is maintained next to the output. If the checksum of the source matches the stored value, the copy is skipped entirely. This avoids redundant I/O for large assets (fonts, third-party libraries) that rarely change between builds.

Saves an OutputResourceGroup to a directory which contains its nested files.