Add gitignore for zlibrary data and include Plurimath analysis script

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jcasimir

.gitignore

@@ -42,3 +42,7 @@
 
 # Aspose license file
 /scripts/Aspose.Words.lic
+
+# Z-Library scraping data
+/data/zlibrary-*
+/script/zlibrary_*

script/analyze_plurimath_failures.rb

@@ -0,0 +1,16 @@
+require "json"
+
+data = JSON.parse(File.read("data/plurimath-failing-expressions.json"))
+
+# Group by element signature
+by_elements = data.group_by { |d| d["elements"].join(", ") }
+puts "#{data.count} unique patterns in #{by_elements.count} element groups:\n"
+
+by_elements.each do |elements, items|
+  puts "Elements: #{elements}"
+  puts "  Count: #{items.count}"
+  items.first(3).each do |item|
+    puts "    #{item['file']}: [#{item['text']}]"
+  end
+  puts
+end