Drop St. Giles and Ss. Twelve Brothers from Sept 1

User decision to carry no saints on Sept 1. Data files for both
saints (and their propers/commemoration bundles) are left in place,
restorable by re-adding the sanctoral-calendar.yml list entry, same
pattern used when St. Hermes was dropped from 8/28.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017XMSokiTD2Qc5vPP2YQu3Q

src/data/calendar/sanctoral-calendar.yml

@@ -315,7 +315,6 @@ days:
   # Michaelmas. Kept mapped here anyway as a deliberate, informed
   # simplification (explicit user decision, 2026-08), not an oversight --
   # see st-michael.yml.
-  "09-01": [st-giles, ss-twelve-brothers]
   "09-02": [st-stephen-of-hungary]
   "09-03": [st-pius-x]
   "09-05": [st-lawrence-justinian]