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Revert Residue Check Tests Whether a Small Refactor Leaves Hidden State Behind

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A developer argues that passing golden-output tests does not prove a refactor is clean, since a patch can still leave lasting side effects such as cache entries or registry changes. The proposed fix adds a step after characterization tests: apply the patch, revert it, and confirm the original files are byte-identical. Tests are configured to write their outputs to disk through an environment-variable-based fixture so that artifacts can be hashed. A driver script runs the suite before the patch, after it, and after the revert, then compares SHA-256 fingerprints and git status. Any difference after the revert is reported as residue, indicating the change was not truly small.

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