propers: Benedictus antiphons for January's sanctoral entries (9/9)

All 9 January saints with a propers id: 5 authored fresh (Marcellus I,
Paul the Hermit, Fabian & Sebastian, Vincent & Anastasius, John
Chrysostom), 3 corrected (Chair of St. Peter at Rome, Agnes,
Conversion of St. Paul -- each confirmed sourced from the Roman rite's
raw [Ant 1] rather than a real Monastic 1617 rendering, same mistake
as St. Lawrence's earlier fix), 1 left honestly missing (Hilary of
Poitiers -- this app's calendar has him Jan 23, but Divinum Officium's
own calendar has him Jan 14; flagged in TODO.md rather than guessed
at). See TODO.md for the full remaining scope and the method this
settled on after automated matching proved unreliable on real edge
cases (shared dates, saints the reference engine doesn't carry at
all).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

TODO.md

@@ -56,31 +56,59 @@ collect has ever been authored for an octave (the octave-reading pull only
 ever sourced Matins content). Every octave commemoration currently
 contributes zero text to Lauds'/Vespers' collect sequence.
 
-## Correctness risk — needs verification, not just authoring
+## Benedictus antiphons for every sanctoral/temporal entry (in progress)
 
-### Per-saint Benedictus antiphons may be sourced from the wrong rite
+Full scope, corrected after actually enumerating it (an earlier pass here
+under-counted): **109 sanctoral entries have `propers` set** (a saint id
+that both a collect and an antiphon key off) and need a real Benedictus
+antiphon; **94 more saints have `propers: null`** (no collect *or* antiphon
+authored, ever) and are a separate, bigger prerequisite — see below. Plus
+**~52 temporal entries** (every numbered Sunday/feria) need one too.
 
-`<saint>-antiphon.yml` files (17 of them, see below) were pulled during the
-original sanctoral-content sessions, months before Lauds existed to consume
-them. Building St. Lawrence's psalmody override surfaced, by accident, that
-his had been read from the **Roman/secular rite's `[Ant 1]`**, not Monastic
-1617's actual Benedictus antiphon for that day — two genuinely different
-texts. Fixed for Lawrence. **Not checked for any of the other 16**:
+### Confirmed systemic bug, not just "unverified"
 
-apparition-of-st-michael, chair-of-st-peter-at-antioch, chair-of-st-peter-at-rome,
-conversion-of-st-paul, holy-innocents, nativity-bvm, nativity-of-st-john-the-baptist,
-ss-peter-and-paul, ss-philip-and-james, st-andrew, st-john-apostle,
-st-john-before-the-latin-gate, st-martin-of-tours, st-peter-ad-vincula,
-st-stephen-protomartyr, st-thomas-apostle.
+Every pre-existing `<saint>-antiphon.yml` file (there were 17, pulled during
+the original sanctoral-content sessions, months before Lauds existed) was
+sourced from the **Roman/secular rite's raw `[Ant 1]`**, not a live Monastic
+1617 query. St. Lawrence's turned out wrong this way; going back and
+correcting 3 more (Chair of St. Peter at Rome, St. Agnes, Conversion of St.
+Paul) while working January confirms it's the same mistake every time, not
+a one-off — **treat all pre-existing antiphon files as wrong until
+re-verified against a live Monastic query**, not just flagged for a look.
 
-Each needs a live `command=prayLaudes` query on the saint's own day (Monastic
-1617) to confirm or correct — same check that caught Lawrence's.
+### Method, worked out the hard way this pass
 
-The other 12 duplex-majus+ saints with `propers` set have **no antiphon file
-at all yet** (st-scholastica, st-matthias, st-matthew, st-mark, st-luke,
-st-james-the-greater, st-bartholomew, st-barnabas, ss-simon-and-jude,
-immaculate-conception, assumption, all-saints) — these don't have the wrong-rite
-risk, they just don't exist yet.
+A saint's raw per-date file (`Latin/SanctiM/MM-DD.txt`, falling back to
+`Latin/Sancti/MM-DD.txt`) is *not* a reliable shortcut — Monastic doesn't
+always compute the Benedictus antiphon from a literal `[Ant 1]` field (major
+feasts like Lawrence draw it from elsewhere entirely), and a shared date
+with two co-assigned saints only has *one* real file, which may belong to
+whichever saint reliably loses the day, not the one this app's calendar
+means to ask about. What actually works: a live `command=prayLaudes` query
+on the saint's own date, checked by eye against 2-3 different years for a
+title that plausibly names the saint and stays consistent — full automation
+kept producing false positives/negatives on exactly these edge cases, so
+each result needs a human read, not just a script.
+
+Also found along the way: **this app's calendar and the reference engine's
+own calendar don't always agree on dates.** St. Hilary of Poitiers is
+assigned Jan 23 here, but Divinum Officium's actual calendar has him on Jan
+14 (confirmed: nothing resembling Hilary appears under Jan 23 in any tested
+year). Not fixed — flagged. Worth a pass at some point checking whether any
+other already-authored saints have a similar date mismatch, since it would
+affect their existing collects too, not just a pending antiphon.
+
+### Progress
+
+- **January (9 total): done.** 8 antiphons authored/corrected (St. Marcellus
+  I, Chair of St. Peter at Rome, St. Paul the Hermit, Ss. Fabian and
+  Sebastian, St. Agnes, Ss. Vincent and Anastasius, Conversion of St. Paul,
+  St. John Chrysostom). St. Hilary of Poitiers left `missing`, see the date
+  mismatch above.
+- **February-December (100 saints): not started.**
+- **~52 temporal entries: not started.**
+- **94 `propers: null` saints: not started** — need a collect authored (a
+  bigger, separate task) before an antiphon id even has anywhere to attach.
 
 ## Mechanism not built at all