d81ede12

By: Tom Sydney Kerckhove <syd@cs-syd.eu>

Revert MutationId [Text] back to [String] to fix transitive linker failure

The Text-based approach required injecting mutationTextPack calls into
every compiled module, creating unresolved symbol references in static
archives. Downstream packages that link against those archives fail unless
sydtest-mutation-plugin is in their dependency graph.

Keep MutationId [String] (no external symbol references injected) but fix
GenValid MutationId to generate via T.unpack <$> genValid, avoiding the
surrogate-character roundtrip failures that motivated the Text switch.

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