=== BUG A: duplicate word-replacement prevention ===
  ✅ duplicate detected (is_duplicate = true)
  ✅ duplicate NOT added to list
  ✅ non-duplicate IS added

=== BUG B: sanitizeChannel path-traversal ===
  ✅ '..' is sanitized to empty (no traversal)
  ✅ '../evil' sanitized (only alnum+underscore)
  ✅ '@channel' keeps name without @
  ✅ 'my_channel2' unchanged

=== BUG C: stats counter logic ===
  ✅ run_posts counts only forwarded
  ✅ run_filtered counts filtered
  ✅ channel posts_forwarded incremented
  ✅ channel posts_filtered incremented

=== BUG D: null-safe json_decode in media loop ===
  ✅ non-JSON response handled without warning
  ✅ ok:true response accepted

===========================================
Result: 13 passed, 0 failed