Temporal Utils by Ian Macalinao
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    Variable PLAIN_YEAR_MONTH_PATTERNConst

    PLAIN_YEAR_MONTH_PATTERN: "^\\d{4}-(0[1-9]|1[0-2])$"

    Regex pattern for Temporal.PlainYearMonth ISO 8601 strings (e.g. 2023-01). Validates month (01–12).