Avoid global date format mutation - #108
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Summary
FixtureBuilder temporarily replaced
Date::DATE_FORMATS[:default]while generating fixtures. That process-global mutation could affect unrelated work running concurrently and uses a Rails API that now emits a deprecation warning.Active Record's uncast date attributes already produce ISO-formatted fixture values, so this removes the global override. Regression coverage observes the date format during generation and confirms that generated dates remain ISO formatted.
Fixes #69