list_working_day_calendars

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Use this before a working-day or business-day task to select the correct evidence package. It distinguishes the worldwide CLDR weekday/weekend baseline, the broad source-labelled OpenWorkdays national-scope reference, the clearly labelled OpenHolidays nationwide public-holiday reference, and the official public-holiday calendars for mainland China, Singapore, Australia, the US, Canada, Japan, India's central government, UAE federal government, New Zealand, South Africa, Ireland plus the UK. The result contains one machine-readable route per CLDR territory, or one route when the optional territory filter is supplied, including whether holiday semantics are unsupported, reference-only, or require a jurisdiction-specific input such as the UK division, Australian state/territory or Indian office scope. US is OPM federal scope only; CA is Canada Labour Code federally regulated-employer scope and does not infer substitute days; JP is statutory national holidays only and does not infer employer closures; IN preserves Gazetted/Restricted classes and does not infer state/UT or local optional selections; AE is UAE federal-government scope with exact 2026 dates only and does not infer local/private schedules or unresolved lunar dates; NZ is national statutory dates only and does not infer regional anniversary days; ZA is national public holidays over a Monday-Friday baseline and does not infer employer holiday exchanges; IE excludes Good Friday and does not infer next-working-day closures for weekend holidays. This is read-only catalogue discovery; it does not calculate a date or count and must not be reported as a calculation success.