Status: IN
Solutions handle degenerate inputs (empty strings, zero, single-element collections) without runtime crashes.
Most edge cases are handled safely, but three specific crash/incorrect-result bugs prevent the universal claim; retracting them validates it
Depends on (SL): valid-palindrome-empty-is-palindrome, palindrome-perm-empty-string-true, empty-input-returns-zero-majority, crawler-log-depth-clamped-at-zero
Unless: pillow-holder-n1-crash, circular-sentence-nonempty-assumed, zero-input-returns-false