[Epic] Calendar-mode comparison #311
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area: build
area: ci
area: compare
area: data
area: engine
area: model
area: provenance
area: rite
area: validation
backport
blocked
breaking
confirmed
dependencies
duplicate
epic
github_actions
invalid
needs-info
needs-triage
php
priority: high
priority: low
priority: medium
regression
type: bug
type: chore
type: correction
type: docs
type: enhancement
type: feature
type: fix
type: perf
type: refactor
type: security
wontfix
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Reference
Directorium/Core#311
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The cheapest, earliest comparison mode: for a day/range/year, compare what each edition celebrates (feast, rank/class, colour, commemorations, season). Needs only ≥2 calendar engines — available at ~1.0 across the traditional editions (1962/1954/1955). Done when two traditional editions can be diffed for a date range.
Epic — child issues are tracked as sub-issues.
Epic complete — both children merged in PR #472. Calendar-mode comparison ships:
CalendarComparator(compareDay/compareRange, N-way symmetric edition diff on feast/rank/colour/commemorations/season) +SequenceComparator(acrossYears/acrossEditions for the slider), over a text-freesrc/Compare/taxonomy that is the pattern-setter for the v2.0 rite/office diff. Documented in docs/design/calendar-comparison-model.md; tests pinned to real engine divergences; adversarial review GO.