fix: retry failed group subpages, add rate-limit detection in scraper

- Detect Wikipedia plain-text rate-limit response ("You are making too many
  requests") and wait 30s before retrying, rather than silently failing
- Increase inter-attempt delay from 3s to 15s per attempt
- Increase group subpage delay from 1.2s to 3s, year delay from 0.6s to 2s
- Re-scrape 1982, 1998, 2002, 2006 which had failed groups; all groups now
  complete — e.g. 2002 now has 64 matches including Group E (Germany/Klose)

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

lib/wiki-scraper.ts

@@ -58,14 +58,17 @@ type State = { active: boolean; round: string; group: string | null }
 
 const delay = (ms: number) => new Promise(r => setTimeout(r, ms))
 
-export async function fetchWikiHtml(page: string, retries = 5): Promise<string | null> {
+export async function fetchWikiHtml(page: string, retries = 6): Promise<string | null> {
   const url = `https://en.wikipedia.org/w/api.php?action=parse&page=${encodeURIComponent(page)}&format=json&prop=text&disabletoc=1`
   for (let attempt = 0; attempt < retries; attempt++) {
     try {
-      if (attempt > 0) await delay(3000 * attempt)
-      const res = await fetch(url, { headers: { 'User-Agent': 'WorldCupScraper/1.0' } })
+      if (attempt > 0) await delay(15000 * attempt)
+      const res = await fetch(url, { headers: { 'User-Agent': 'WorldCupScraper/1.0 (worldcup-stats)' } })
+      if (res.status === 429) { await delay(30000); continue }
       if (!res.ok) continue
-      const data = await res.json() as { parse?: { text?: { '*': string } } }
+      const text = await res.text()
+      if (text.toLowerCase().startsWith('you are making')) { await delay(30000); continue }
+      const data = JSON.parse(text) as { parse?: { text?: { '*': string } } }
       const html = data?.parse?.text?.['*']
       if (html) return html
     } catch {
@@ -414,7 +417,7 @@ export async function scrapeYear(
       process.stdout.write(`[skip ${group}] `)
       continue
     }
-    await delay(1200)
+    await delay(3000)
     const subHtml = await fetchWikiHtml(page)
     if (!subHtml) { process.stdout.write(`(failed: ${page}) `); continue }