build-feed globbed fixtures by site (`fandom-*`), so a second Fandom page
for a game, such as Genshin's Miliastra Pass beside its event page, would
have handed its fixture to the events parser. pickFixture matches the
source's whole name followed by a date. Every fixture already follows
that name, and the built feed is unchanged (206 events, same ids).
Co-Authored-By: Claude Opus 5.5 <[email protected]>