Add August Matins readings for SanctiM-track saints

13 of August's 16 SanctiM-track saints authored, including the Duplex
I class feasts of St. Lawrence and the Assumption of the B.V.M. The
Assumption's presence confirms this app's calendar already maps fixed
BVM feasts, despite an older note in the parent workspace CLAUDE.md
suggesting otherwise -- flagged in memory as stale documentation to
verify against, not trust blindly. 3 saints left unsourced (Common-only
or Nocturn-1-only vigil content).

TODO.md

@@ -37,7 +37,7 @@ across every hour and content type in this app.
      saints (Tridentine/Divino Afflatu-sourced, no Monastic 1617 track) are now done — see
      "Pre-1955 saints' Matins readings" below. The larger pool of saints that *do* have a
      Monastic 1617 track (`SanctiM/`) is in progress — see "SanctiM-track saints' Matins
-     readings" below — January-July done (71/82), ~78 candidates remain (August onward).
+     readings" below — January-August done (84/98), ~65 candidates remain (September onward).
    - The bulk Vulgate (Latin) + Douay-Rheims (English) scripture import into
      `src/data/scripture/` — long-term project, explicitly deferred; Matins scripture
      citations resolve to `missing` text until it lands.
@@ -1501,7 +1501,21 @@ July) — every SanctiM file at these dates that isn't a saint's own real match
 puzzle over. Recognize this pattern (`In Octava S. P. N. Benedicti Abbatis`) and move on
 quickly rather than re-investigating it saint by saint.
 
-**Not done in this pass**: the remaining ~78 SanctiM-track candidates (August onward) — same
+**August done (13/16 saints, 3 left unauthored as no-proper-content)**: `st-peter-ad-vincula`,
+`ss-machabees` (missed pre-1955-pool candidate), `st-stephen-i` (missed pre-1955-pool, "plain
+file is a different, later saint" trap), `st-dominic`, `ss-cyriacus-largus-and-smaragdus`,
+`st-clare` (missed pre-1955-pool candidate), `st-lawrence` (Duplex I class), `st-bernard`,
+`st-bartholomew`, `st-augustine`, `decollation-of-st-john-baptist`, `st-sabina` (missed
+pre-1955-pool candidate), and `assumption` — the Duplex I class feast of the B.V.M. itself,
+confirming this app's calendar does map the Assumption despite the parent CLAUDE.md's older
+note that fixed BVM/Lord feasts were "not modeled by this app at all yet"; Nocturn 1's own
+scripture (Song of Songs) left to the bible-plan store per this project's usual split, only
+Nocturn 2/3 patristic/Gospel content authored here. Left unauthored (no proper content at all
+in the source, same category as prior Common-only/Vigil exceptions): `ss-nabor-and-felix`-style
+`st-romanus` and `st-hermes` (both Common-only), `vigil-of-st-lawrence` (Nocturn 1 only, no
+Nocturn 2/3 content in either track). `npm test`/`tsc --noEmit` both pass.
+
+**Not done in this pass**: the remaining ~65 SanctiM-track candidates (September onward) — same
 authoring shape, continue month by month.
 
 ### Bible-plan TSV — bulk conversion done (2026-08)