fix(privacy): remove answer-key pattern collision

Apply owner-case-purge fix2 P0/F3 corrections.

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

scripts/import_yinduzhanxing.py

@@ -56,7 +56,6 @@ REQUIRED_PROTECTED_PATTERNS = frozenset({
 REQUIRED_PRIVACY_PATH_PATTERNS = (
     "**/*1993*",
     "**/*wenmo*",
-    "**/*pl9_1993*",
     "**/character_level_*",
     "**/whole_machine_*",
     "**/workbuddy_round*",