fix(merge): pair Genshin character trials across sources

Game8's generic trial title and Fandom's changing character list now refer
to the same banner phase in refreshed snapshots. Recognize the registered
trial article family under the existing start-date guard, without widening
fuzzy matching or combining consecutive phases. Carry the absorbed ID so
completion, notes and daily progress follow the surviving row.

src/ingest/merge.ts

@@ -179,6 +179,8 @@ function isSameEvent(
   // to be close before treating two entries as one event.
   if (hoursBetween(a.startsAt, b.startsAt) > toleranceHours) return false;
 
+  if (sameGenshinTrial(a, b)) return true;
+
   const titled = (x: GachaEvent, y: GachaEvent) =>
     titleSimilarity(x.title, y.title) >= titleThreshold ||
     titleExtends(x.title, y.title);
@@ -201,6 +203,30 @@ function isSameEvent(
   return !twinIn(a, b.sourceId, b) && !twinIn(b, a.sourceId, a);
 }
 
+/**
+ * Game8 names the trial family; Fandom names its featured characters. Their
+ * shared start identifies a phase (guarded above), while Fandom's dated article
+ * path identifies the activity independently of its changing character list.
+ * Confirmed against both snapshots and the owner's in-game list, 2026-11-01.
+ * End disagreements still go through findConflict; dates are never averaged.
+ */
+function sameGenshinTrial(a: GachaEvent, b: GachaEvent): boolean {
+  if (a.game !== "genshin" || b.game !== "genshin") return false;
+  const generic = (e: GachaEvent) =>
+    e.sourceId === "genshin-game8-events" && /^Character Test Runs?$/i.test(e.title);
+  const named = (e: GachaEvent) => {
+    if (e.sourceId !== "genshin-fandom-events") return false;
+    try {
+      const url = new URL(e.sourceUrl);
+      return url.hostname === "genshin-impact.fandom.com" &&
+        decodeURIComponent(url.pathname) === `/wiki/Test_Run_-_Character_Trial_Event/${e.startsAt.slice(0, 10)}`;
+    } catch {
+      return false;
+    }
+  };
+  return (generic(a) && named(b)) || (named(a) && generic(b));
+}
+
 /**
  * True when one title is the other with words added at either end — the shape
  * a source qualifier actually takes. Appended: "Bedazzling Dawnstar" → "…