Import Validation Issue Suggestion

When Piper raises an ImportValidationIssue, it often has enough context to propose a resolution stored in the suggestion field — for example, matching a misspelled analyte code to the closest known analyte in the registry, or recommending a unit conversion. Compliance reviewers can accept the suggestion by applying it as the overrideValue, or they can enter a different correction if the suggestion is not appropriate. The suggestion is advisory only — the reviewer always makes the final call before the issue is marked resolved and the row proceeds to commit.