Fix multi-month scrape coverage and add duo MUSIC EXCHANGE

- Extend 8 scrapers (liquid-room, shibuya-o, club-quattro, meets-otsuka,
  nishieifuku-jam, fever-shindaita, fad-yokohama, and new duo-music-exchange)
  to fetch 3 calendar months instead of 1-2, covering the full 65-day window
- Add duo MUSIC EXCHANGE scraper (渋谷, ~700 cap, /schedule/YYYY/index_YYYY-MM.html)
- Add npm test: Node.js built-in test runner verifies each scraper fetches
  all required month URLs via mocked fetch (10 tests, no extra deps)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/app/scrapers/fever-shindaita.ts b/app/scrapers/fever-shindaita.ts
index 62c2e2c..6356343 100644
--- a/app/scrapers/fever-shindaita.ts
+++ b/app/scrapers/fever-shindaita.ts
@@ -108,11 +108,11 @@ export const scraper: Scraper = {
   venue,
   async scrape(): Promise<EventInput[]> {
     const now = new Date();
-    const thisMonth = `${now.getFullYear()}-${String(now.getMonth() + 1).padStart(2, "0")}`;
-    const next = new Date(now.getFullYear(), now.getMonth() + 1, 1);
-    const nextMonth = `${next.getFullYear()}-${String(next.getMonth() + 1).padStart(2, "0")}`;
-
-    const [a, b] = await Promise.all([scrapeMonth(thisMonth), scrapeMonth(nextMonth)]);
-    return [...a, ...b];
+    const months = [0, 1, 2].map((offset) => {
+      const d = new Date(now.getFullYear(), now.getMonth() + offset, 1);
+      return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, "0")}`;
+    });
+    const results = await Promise.all(months.map(scrapeMonth));
+    return results.flat();
   },
 };