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 One line per release. Versions are git tags (`vX.Y.Z`).
 
+## [0.5.0] - 2026-08-18
+- Two corrections, both found in primary sources the project already had but had not fully read. **`ubaldus` (16 May) and `didacus` (13 November) are III-class feasts, not commemorations** — found by auditing *all 290* fixed-date sanctoral entries against the Missal's own universal calendarium, anchored on the Roman calends column because the arabic day numbers are OCR-wrecked and the dominical letters vanish in some months. They were the only two status defects in the file; the 15 days the automated pass could not reach were read by hand. Universality is structural, not a judgement call: the calendarium carries no *pro aliquibus locis* marker in its 573 lines while the wider Missal carries 79 elsewhere, and each saint has his own Mass entry in the Proprium, which a bare commemoration never has. Neither needed a proper authored — each takes its Mass from a Common with only its Oratio proper — though one Common was newly transcribed (*Missa Iustus*, 1 Cor 4:9-14 / Luke 12:32-34, read independently in both scans). 13 036 days change, every one classified. **RG 113's first sentence is now implemented**: *"Commemoratio de Tempore fit primo loco"* — only its second sentence was, so ordering ran through the precedence table for every commemoration including the seasonal one. Reconciled with RG 110(c)'s *"ante omnes alias commemorationes"* by the term the two rubrics share, whose sense RG 113's own sentence fixes: season, then the inseparable Peter/Paul pair, then table order. 3 533 days change, **every one order-only** — identical commemoration sets, verified as sorted multisets. Also: every Latin quotation in the rules register re-audited against the electronic transcription — all 26 rubric quotations verbatim, zero errors — which established that rubrics must be checked against the transcription and propers against the photographic scans, the confusion that nearly lost RG 110(c). 396 tests.
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 ## [0.4.0] - 2026-08-18
 - Three colour corrections, and the first findings in this project's history made against sources **outside its own data lineage**. colitur was bootstrapped from lectio, lectio's ini is generated from missalemeum, and missalemeum uses Divinum Officium's data files — so the differential and the oracle, layers 3 and 4, are one witness counted twice, and an error inherited at the root is invisible to both. Two sources outside that tree were admitted this release, each with its rubrical edition established *before* use: a published **1962 Ordo** (three liturgical years, 1091 days, 1504 permitted Masses) and **O'Connell's *The Celebration of Mass*, 4th ed. (1964)**, revised throughout to the Codex Rubricarum (1960) and the 1962 Missal. **Good Friday is black, not violet** (RG 128(b)'s own exception for the *Actio liturgica ... usque ad Communionem exclusive*, with RG 132) — recorded in the register as an acknowledged gap since Task 16 and closed here. **The Vigil of the Assumption and the Vigil of St Lawrence are violet**, not white and red (RG 128, "vigils of II and III class outside Paschaltide"); the Ascension's vigil is untouched, being the one such vigil *inside* Paschaltide. That rule had sat transcribed in the register since 11 August, disagreeing with the shipped data the whole time, while both layers stayed green on the shared error. 22 809 days change across 1583–9999, every one colour-only, none unclassified — and the two vigils' identical 7 196 was verified against an independent implementation rather than accepted. Also: **rose stays on Gaudete and Laetare**, now a decided position rather than an unexamined one (RG 131 is permissive, so the colour field carries a permission there, not a requirement). Divergences from every Divinum-Officium-lineage source are cited, not adopted: C37 and M29. 395 tests.