feat: add wiki.gg as a second Endfield source

First non-Game8 parser, and the first source that states region-scoped ends:
wiki.gg emits ISO timestamps with one timer per server region, so Endfield
events now carry exact times and separate Asia / Americas-Europe ends. That
gap is up to 13 hours, which is what regionEnds was built for.

Two sources for one game also exercised merge for real. It caught both
overlaps — including "Bedazzling Dawnstar" against Game8's "Bedazzling
Dawnstar Sign-In" — and flagged that the two disagree on the end date by 70
hours rather than averaging them into a date neither states.

Matching an appended qualifier needed a prefix test, not a subset test: a
subset would also fuse "Gold Clash" with "Gold Rush Clash Royale".

Also fixes build-feed picking fixtures by game rather than by source, which
handed the wiki.gg page to the Game8 parser once Endfield had two.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

scripts/build-feed.ts

@@ -14,13 +14,20 @@ import type { GachaEvent, GameId } from "../src/shared/schema.ts";
 
 const OUT = "public/data/events.v1.json";
 
-/** Newest fixture per adapter. */
+/**
+ * Newest fixture for one *source*, not one game.
+ *
+ * A game can have several sources, and fixtures are named `<site>-events-<date>`
+ * against adapter ids of `<game>-<site>-events`. Globbing by game alone hands
+ * one site's page to another site's parser.
+ */
 async function latestFixture(adapterId: string, game: GameId) {
-  const glob = new Bun.Glob(`fixtures/${game}/*.html`);
-  const files = [...glob.scanSync(".")].sort();
+  const site = adapterId.replace(`${game}-`, "").replace(/-events$/, "");
+  const pattern = `fixtures/${game}/${site}-*.html`;
+  const files = [...new Bun.Glob(pattern).scanSync(".")].sort();
   const file = files.at(-1);
   if (file === undefined) {
-    throw new Error(`no fixture found for ${adapterId} (fixtures/${game}/*.html)`);
+    throw new Error(`no fixture found for ${adapterId} (${pattern})`);
   }
   return { file, html: await Bun.file(file).text() };
 }