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]>

src/ingest/parsers/index.ts

@@ -1,4 +1,5 @@
 import { game8Parser } from "./game8.ts";
+import { wikiGgParser } from "./wikigg.ts";
 import type { SourceParser } from "./types.ts";
 
 /**
@@ -6,7 +7,7 @@ import type { SourceParser } from "./types.ts";
  * an entry in `adapters/index.ts`; adding a new *site* means a parser module
  * here and one line below.
  */
-export const PARSERS: SourceParser[] = [game8Parser];
+export const PARSERS: SourceParser[] = [game8Parser, wikiGgParser];
 
 export function parserById(id: string): SourceParser | undefined {
   return PARSERS.find((p) => p.id === id);
@@ -14,3 +15,4 @@ export function parserById(id: string): SourceParser | undefined {
 
 export type { SourceParser } from "./types.ts";
 export { game8Parser } from "./game8.ts";
+export { wikiGgParser } from "./wikigg.ts";