chore: ignore raw word-bank candidate files

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

.gitignore

@@ -15,3 +15,6 @@ raw/russian-5letter-freq-sortalpha.txt
 raw/russian-5letter-freq-sortfreq-wordsonly.txt
 raw/russian-5letter-freq-sortfreq.txt
 raw/russian-mnemonic-words-52.txt
+raw/ru-add/russian-new0718.txt
+.gitignore
+raw/ru-add/russian-newcandidates.txt